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Friday the 13th

Updated: Wikipedia source

Friday the 13th

Friday the 13th is considered an unlucky day in Western superstition. It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year. For a month to have a Friday the 13th, the first day of the month must be a Sunday.

Tables

Distribution of the 13th day per weekday over 4,800 months (400 years)
Occurrences
Occurrences
Day of the week
Occurrences
Monday
685
Tuesday
685
Wednesday
687
Thursday
684
Friday
688
Saturday
684
Sunday
687
Day of the week
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Occurrences
685
685
687
684
688
684
687
Months with the 13th on a Friday for years from 1900 through 2100 · Occurrence › Distribution
20th-century: 1905, 1911, 1922, 1928, 1933, 1939, 1950, 1956, 1961, 1967, 1978, 1984, 1989, 1995;21st-century: 2006, 2012, 2017, 2023, 2034, 2040, 2045, 2051, 2062, 2068, 2073, 2079, 2090, 2096
20th-century: 1905, 1911, 1922, 1928, 1933, 1939, 1950, 1956, 1961, 1967, 1978, 1984, 1989, 1995;21st-century: 2006, 2012, 2017, 2023, 2034, 2040, 2045, 2051, 2062, 2068, 2073, 2079, 2090, 2096
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1905, 1911, 1922, 1928, 1933, 1939, 1950, 1956, 1961, 1967, 1978, 1984, 1989, 1995;21st-century: 2006, 2012, 2017, 2023, 2034, 2040, 2045, 2051, 2062, 2068, 2073, 2079, 2090, 2096
Month withits 13th ona Friday
January
Year lengthand weekday ofJanuary the 1st
365: Sunday366: Sunday
Year'sdominicalletter
AAG
20th-century: 1903, 1914, 1920, 1925, 1931, 1942, 1948, 1953, 1959, 1970, 1976, 1981, 1987, 1998;21st-century: 2004, 2009, 2015, 2026, 2032, 2037, 2043, 2054, 2060, 2065, 2071, 2082, 2088, 2093, 2099
20th-century: 1903, 1914, 1920, 1925, 1931, 1942, 1948, 1953, 1959, 1970, 1976, 1981, 1987, 1998;21st-century: 2004, 2009, 2015, 2026, 2032, 2037, 2043, 2054, 2060, 2065, 2071, 2082, 2088, 2093, 2099
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1903, 1914, 1920, 1925, 1931, 1942, 1948, 1953, 1959, 1970, 1976, 1981, 1987, 1998;21st-century: 2004, 2009, 2015, 2026, 2032, 2037, 2043, 2054, 2060, 2065, 2071, 2082, 2088, 2093, 2099
Month withits 13th ona Friday
February
Year lengthand weekday ofJanuary the 1st
365: Thursday366: Thursday
Year'sdominicalletter
DDC
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992; 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992; 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992; 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
Month withits 13th ona Friday
March
Year lengthand weekday ofJanuary the 1st
365: Thursday366: Wednesday
Year'sdominicalletter
DED
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984; 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984; 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984; 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
Month withits 13th ona Friday
April
Year lengthand weekday ofJanuary the 1st
365: Monday366: Sunday
Year'sdominicalletter
GAG
20th-century: 1904, 1910, 1921, 1927, 1932, 1938, 1949, 1955, 1960, 1966, 1977, 1983, 1988, 1994;21st-century: 2005, 2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095
20th-century: 1904, 1910, 1921, 1927, 1932, 1938, 1949, 1955, 1960, 1966, 1977, 1983, 1988, 1994;21st-century: 2005, 2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1904, 1910, 1921, 1927, 1932, 1938, 1949, 1955, 1960, 1966, 1977, 1983, 1988, 1994;21st-century: 2005, 2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095
Month withits 13th ona Friday
May
Year lengthand weekday ofJanuary the 1st
365: Saturday366: Friday
Year'sdominicalletter
BCB
20th-century: 1902, 1913, 1919, 1924, 1930, 1941, 1947, 1952, 1958, 1969, 1975, 1980, 1986, 1997;21st-century: 2003, 2008, 2014, 2025, 2031, 2036, 2042, 2053, 2059, 2064, 2070, 2081, 2087, 2092, 2098
20th-century: 1902, 1913, 1919, 1924, 1930, 1941, 1947, 1952, 1958, 1969, 1975, 1980, 1986, 1997;21st-century: 2003, 2008, 2014, 2025, 2031, 2036, 2042, 2053, 2059, 2064, 2070, 2081, 2087, 2092, 2098
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1902, 1913, 1919, 1924, 1930, 1941, 1947, 1952, 1958, 1969, 1975, 1980, 1986, 1997;21st-century: 2003, 2008, 2014, 2025, 2031, 2036, 2042, 2053, 2059, 2064, 2070, 2081, 2087, 2092, 2098
Month withits 13th ona Friday
June
Year lengthand weekday ofJanuary the 1st
365: Wednesday366: Tuesday
Year'sdominicalletter
EFE
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984, 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984, 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984, 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
Month withits 13th ona Friday
July
Year lengthand weekday ofJanuary the 1st
365: Monday366: Sunday
Year'sdominicalletter
GAG
20th-century: 1909, 1915, 1920, 1926, 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, 1993, 1999;21st-century: 2004, 2010, 2021, 2027, 2032, 2038, 2049, 2055, 2060, 2066, 2077, 2083, 2088, 2094, 2100
20th-century: 1909, 1915, 1920, 1926, 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, 1993, 1999;21st-century: 2004, 2010, 2021, 2027, 2032, 2038, 2049, 2055, 2060, 2066, 2077, 2083, 2088, 2094, 2100
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1909, 1915, 1920, 1926, 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, 1993, 1999;21st-century: 2004, 2010, 2021, 2027, 2032, 2038, 2049, 2055, 2060, 2066, 2077, 2083, 2088, 2094, 2100
Month withits 13th ona Friday
August
Year lengthand weekday ofJanuary the 1st
365: Friday366: Thursday
Year'sdominicalletter
CDC
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
Month withits 13th ona Friday
September
Year lengthand weekday ofJanuary the 1st
365: Tuesday366: Monday
Year'sdominicalletter
FGF
20th-century: 1905, 1911, 1916, 1922, 1933, 1939, 1944, 1950, 1961, 1967, 1972, 1978, 1989, 1995, 2000;21st-century: 2006, 2017, 2023, 2028, 2034, 2045, 2051, 2056, 2062, 2073, 2079, 2084, 2090
20th-century: 1905, 1911, 1916, 1922, 1933, 1939, 1944, 1950, 1961, 1967, 1972, 1978, 1989, 1995, 2000;21st-century: 2006, 2017, 2023, 2028, 2034, 2045, 2051, 2056, 2062, 2073, 2079, 2084, 2090
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1905, 1911, 1916, 1922, 1933, 1939, 1944, 1950, 1961, 1967, 1972, 1978, 1989, 1995, 2000;21st-century: 2006, 2017, 2023, 2028, 2034, 2045, 2051, 2056, 2062, 2073, 2079, 2084, 2090
Month withits 13th ona Friday
October
Year lengthand weekday ofJanuary the 1st
365: Sunday366: Saturday
Year'sdominicalletter
ABA
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992, 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992, 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992, 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
Month withits 13th ona Friday
November
Year lengthand weekday ofJanuary the 1st
365: Thursday 366: Wednesday
Year'sdominicalletter
D ED
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
Month withits 13th ona Friday
December
Year lengthand weekday ofJanuary the 1st
365: Tuesday366: Monday
Year'sdominicalletter
FGF
Years during which a Friday the 13thoccurs in the month to the right(current and subsequent year are marked in bold)
Month withits 13th ona Friday
Year lengthand weekday ofJanuary the 1st
Year'sdominicalletter
20th-century: 1905, 1911, 1922, 1928, 1933, 1939, 1950, 1956, 1961, 1967, 1978, 1984, 1989, 1995;21st-century: 2006, 2012, 2017, 2023, 2034, 2040, 2045, 2051, 2062, 2068, 2073, 2079, 2090, 2096
January
365: Sunday366: Sunday
AAG
20th-century: 1903, 1914, 1920, 1925, 1931, 1942, 1948, 1953, 1959, 1970, 1976, 1981, 1987, 1998;21st-century: 2004, 2009, 2015, 2026, 2032, 2037, 2043, 2054, 2060, 2065, 2071, 2082, 2088, 2093, 2099
February
365: Thursday366: Thursday
DDC
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992; 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
March
365: Thursday366: Wednesday
DED
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984; 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
April
365: Monday366: Sunday
GAG
20th-century: 1904, 1910, 1921, 1927, 1932, 1938, 1949, 1955, 1960, 1966, 1977, 1983, 1988, 1994;21st-century: 2005, 2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095
May
365: Saturday366: Friday
BCB
20th-century: 1902, 1913, 1919, 1924, 1930, 1941, 1947, 1952, 1958, 1969, 1975, 1980, 1986, 1997;21st-century: 2003, 2008, 2014, 2025, 2031, 2036, 2042, 2053, 2059, 2064, 2070, 2081, 2087, 2092, 2098
June
365: Wednesday366: Tuesday
EFE
20th-century: 1900, 1906, 1917, 1923, 1928, 1934, 1945, 1951, 1956, 1962, 1973, 1979, 1984, 1990;21st-century: 2001, 2007, 2012, 2018, 2029, 2035, 2040, 2046, 2057, 2063, 2068, 2074, 2085, 2091, 2096
July
365: Monday366: Sunday
GAG
20th-century: 1909, 1915, 1920, 1926, 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, 1993, 1999;21st-century: 2004, 2010, 2021, 2027, 2032, 2038, 2049, 2055, 2060, 2066, 2077, 2083, 2088, 2094, 2100
August
365: Friday366: Thursday
CDC
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
September
365: Tuesday366: Monday
FGF
20th-century: 1905, 1911, 1916, 1922, 1933, 1939, 1944, 1950, 1961, 1967, 1972, 1978, 1989, 1995, 2000;21st-century: 2006, 2017, 2023, 2028, 2034, 2045, 2051, 2056, 2062, 2073, 2079, 2084, 2090
October
365: Sunday366: Saturday
ABA
20th-century: 1903, 1908, 1914, 1925, 1931, 1936, 1942, 1953, 1959, 1964, 1970, 1981, 1987, 1992, 1998;21st-century: 2009, 2015, 2020, 2026, 2037, 2043, 2048, 2054, 2065, 2071, 2076, 2082, 2093, 2099
November
365: Thursday 366: Wednesday
D ED
20th-century: 1901, 1907, 1912, 1918, 1929, 1935, 1940, 1946, 1957, 1963, 1968, 1974, 1985, 1991, 1996;21st-century: 2002, 2013, 2019, 2024, 2030, 2041, 2047, 2052, 2058, 2069, 2075, 2080, 2086, 2097
December
365: Tuesday366: Monday
FGF
00 06    17 23
00 06    17 23
Yearmodulo 28
00 06    17 23
1600 2000
Jan Oct
1700 2100
Feb Aug
1800 2200
Jun
1900 2300
Jan Apr Jul
Yearmodulo 28
00 06    17 23
01 07 12 18
01 07 12 18
Yearmodulo 28
01 07 12 18
1600 2000
Jan Apr Jul
1700 2100
May
1800 2200
Feb Mar Nov
1900 2300
Sep Dec
Yearmodulo 28
01 07 12 18
02    13 19 24
02    13 19 24
Yearmodulo 28
02    13 19 24
1600 2000
Sep Dec
1700 2100
Jan Oct
1800 2200
Feb Aug
1900 2300
Jun
Yearmodulo 28
02    13 19 24
03 08 14    25
03 08 14    25
Yearmodulo 28
03 08 14    25
1600 2000
Jun
1700 2100
Jan Apr Jul
1800 2200
May
1900 2300
Feb Mar Nov
Yearmodulo 28
03 08 14    25
09 15 20 26
09 15 20 26
Yearmodulo 28
09 15 20 26
1600 2000
Feb Mar Nov
1700 2100
Sep Dec
1800 2200
Jan Oct
1900 2300
Feb Aug
Yearmodulo 28
09 15 20 26
04 10    21 27
04 10    21 27
Yearmodulo 28
04 10    21 27
1600 2000
Feb Aug
1700 2100
Jun
1800 2200
Jan Apr Jul
1900 2300
May
Yearmodulo 28
04 10    21 27
05 11 16 22
05 11 16 22
Yearmodulo 28
05 11 16 22
1600 2000
May
1700 2100
Feb Mar Nov
1800 2200
Sep Dec
1900 2300
Jan Oct
Yearmodulo 28
05 11 16 22
Yearmodulo 28
1600 2000
1700 2100
1800 2200
1900 2300
Yearmodulo 28
00 06 17 23
Jan Oct
Feb Aug
Jun
Jan Apr Jul
00 06 17 23
01 07 12 18
Jan Apr Jul
May
Feb Mar Nov
Sep Dec
01 07 12 18
02 13 19 24
Sep Dec
Jan Oct
Feb Aug
Jun
02 13 19 24
03 08 14 25
Jun
Jan Apr Jul
May
Feb Mar Nov
03 08 14 25
09 15 20 26
Feb Mar Nov
Sep Dec
Jan Oct
Feb Aug
09 15 20 26
04 10 21 27
Feb Aug
Jun
Jan Apr Jul
May
04 10 21 27
05 11 16 22
May
Feb Mar Nov
Sep Dec
Jan Oct
05 11 16 22

References

  1. There were 13 people at the table (at the Last Supper) and the 13th was Jesus. The Last Supper was on a Thursday, and th
  2. In Christian tradition, fear of Friday the 13th stems from the day of the Crucifixion (Friday) and the number at the [ta
  3. A Dictionary of Superstitions
    https://www.oxfordreference.com/display/10.1093/acref/9780192829160.001.0001/acref-9780192829160-e-627
  4. For starters, a 1993 study published in the British Medical Journal indicates otherwise: Researchers analyzed the traffi
  5. The study compared hospital admissions for traffic accidents on a Friday the 13th with those on a Friday the 6th in a co
  6. National Geographic
    https://web.archive.org/web/20191009112626/https://www.nationalgeographic.com/news/2011/5/110513-friday-the-13th-superstitions-triskaidekaphobia/
  7. Mental Floss
    https://www.mentalfloss.com/article/52696/why-friday-13th-considered-unlucky
  8. "Fear of "Friday the 13th may likely have originated from Jesus' last supper and crucifixion", says U.B. anthropologist"
    http://www.buffalo.edu/news/releases/2004/02/6576.html
  9. Encyclopedia of Useless Information
  10. CNN
    https://www.cnn.com/2016/05/12/health/why-we-fear-friday-13th/index.html
  11. A Dictionary of Superstitions
    https://www.oxfordreference.com/display/10.1093/acref/9780192829160.001.0001/acref-9780192829160-e-1438
  12. 13: The Story of the World's Most Popular Superstition
    https://books.google.com/books?id=sDXJ1s0YNAgC
  13. Western Folklore
    https://doi.org/10.2307%2F1497075
  14. HISTORY
    https://www.history.com/topics/folklore/friday-the-13th
  15. "Who's Afraid of Friday the Thirteenth? | Folklife Today"
    https://blogs.loc.gov/folklife/2017/01/whos-afraid-of-friday-the-thirteenth/
  16. The Life of Rossini
  17. Friday, the Thirteenth
    http://www.gutenberg.org/files/12345/12345-h/12345-h.htm
  18. x42
    http://x42.com/datelab/daydist.shtml
  19. American Mathematical Monthly
    https://doi.org/10.2307%2F2301694
  20. Mathematical Astronomy Morsels IV
  21. Johns Hopkins Magazine
    http://pages.jh.edu/jhumag/0907web/golomb2.html
  22. Time and Date (timeanddate.com)
    https://www.timeanddate.com/calendar/13-things-friday-13.html
  23. Time and Date (timeanddate.com)
    https://www.timeanddate.com/calendar/weekday-friday-13
  24. National Geographic News
    https://web.archive.org/web/20040603014858/http://news.nationalgeographic.com/news/2004/02/0212_040212_friday13.html
  25. Via Magazine
    https://web.archive.org/web/20100816035352/http://www.viamagazine.com/travel-tips/friday-13th-lucky-or-unlucky
  26. tyosuojelu.fi
    https://web.archive.org/web/20140429045702/http://www.tyosuojelu.fi/fi/ajankohtaista/5757
  27. www.kotitapaturma.fi
    http://www.kotitapaturma.fi/mika-on-tapaturmapaiva/
  28. British Medical Journal
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1697765
  29. Live Science
    https://www.livescience.com/17900-statistically-speaking-friday-13th-unlucky.html
  30. Slate
    http://www.slate.com/articles/health_and_science/medical_examiner/1998/03/er_and_the_triple_hex.html
  31. The American Journal of Emergency Medicine
    https://doi.org/10.1016%2Fj.ajem.2011.06.008
  32. World Journal of Surgery
    https://doi.org/10.1007%2Fs00268-011-1166-8
  33. Mirror (mirror.co.uk)
    https://www.mirror.co.uk/news/uk-news/friday-13th-is-no-longer-unlucky-313210
  34. Reuters
    https://web.archive.org/web/20081206053052/http://uk.reuters.com/article/oddlyEnoughNews/idUKL1268660720080613
  35. Showbiz Cheat Sheet
    https://web.archive.org/web/20210415175855/https://www.cheatsheet.com/culture/how-1-famous-tattoo-artist-started-the-ritual-of-13-tattoos-on-friday-the-13th.html/
  36. Vice News
    https://www.vice.com/en/article/how-friday-the-13th-became-black-friday-for-tattoos/
  37. Salsa: A taste of Hispanic culture
    https://books.google.com/books?id=os7DMzXq1rcC&pg=PA64
  38. Greek Reporter
    http://greece.greekreporter.com/2015/10/13/why-superstitious-greeks-fear-tuesday-the-13th/
  39. La Stampa
    https://web.archive.org/web/20120818234142/http://www3.lastampa.it/domande-risposte/articolo/lstp/442871/
  40. The Independent
    https://www.independent.co.uk/sport/football/european/bad-omen-for-italy-as-their-unlucky-number-comes-up-400380.html
  41. cafebabel.com
    https://web.archive.org/web/20130608183526/http://www.cafebabel.it/article/24987/venerdi-13-17-fortuna-sfortuna-italia.html
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