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A190653 Years with exactly three "Friday the 13ths", starting from 1901. 4
1903, 1914, 1925, 1928, 1931, 1942, 1953, 1956, 1959, 1970, 1981, 1984, 1987, 1998, 2009, 2012, 2015, 2026, 2037, 2040, 2043, 2054, 2065, 2068, 2071, 2082, 2093, 2096, 2099, 2105, 2108, 2111, 2122, 2133, 2136, 2139, 2150, 2161, 2164, 2167, 2178, 2189, 2192 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A101312(a(n)) = 3, 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

EXAMPLE

A101312(2012) = #{January, April, July} = 3, therefore 2012 is a term.

PROG

(Haskell)

a190653 n = a190653_list !! (n-1)

a190653_list = filter ((== 3) . a101312) [1901..]

CROSSREFS

Cf. A190651, A190652.

Sequence in context: A177137 A190651 A237787 * A124628 A112947 A206124

Adjacent sequences:  A190650 A190651 A190652 * A190654 A190655 A190656

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 16 2011

STATUS

approved

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Last modified November 27 20:15 EST 2014. Contains 250264 sequences.