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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

Index entries for sequences related to calendars

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 04:25 EDT 2017. Contains 289841 sequences.