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 A190652 Years with exactly two "Friday the 13ths", starting from 1901. 4
 1901, 1905, 1906, 1907, 1908, 1911, 1912, 1917, 1918, 1920, 1922, 1923, 1929, 1933, 1934, 1935, 1936, 1939, 1940, 1945, 1946, 1948, 1950, 1951, 1957, 1961, 1962, 1963, 1964, 1967, 1968, 1973, 1974, 1976, 1978, 1979, 1985, 1989, 1990, 1991, 1992, 1995, 1996 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A101312(a(n)) = 2, 1 <= A101312(n) <= 3. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Triskaidekaphobia Wikipedia, Triskaidekaphobia MATHEMATICA Select[Range[1901, 2020], Count[Table[{#, m, 13}, {m, 12}], _?(DayName[#] == Friday&)] == 2&] (* Harvey P. Dale, Oct 02 2018 *) PROG (Haskell) a190652 n = a190652_list !! (n-1) a190652_list = filter ((== 2) . a101312) [1901..] CROSSREFS Cf. A190651, A190653. Sequence in context: A204479 A251346 A078862 * A177137 A273913 A190651 Adjacent sequences:  A190649 A190650 A190651 * A190653 A190654 A190655 KEYWORD nonn AUTHOR Reinhard Zumkeller, May 16 2011 STATUS approved

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Last modified July 27 21:21 EDT 2021. Contains 346316 sequences. (Running on oeis4.)