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A190653
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Years with exactly three "Friday the 13ths", starting from 1901.
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4
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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
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OFFSET
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1,1
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COMMENTS
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A101312(a(n)) = 3, 1 <= A101312(n) <= 3.
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LINKS
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_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
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EXAMPLE
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A101312(2012) = #{January, April, July} = 3, therefore 2012 is a term.
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PROG
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(Haskell)
a190653 n = a190653_list !! (n-1)
a190653_list = filter ((== 3) . a101312) [1901..]
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CROSSREFS
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Cf. A190651, A190652.
Sequence in context: A190652 A177137 A190651 * A124628 A112947 A206124
Adjacent sequences: A190650 A190651 A190652 * A190654 A190655 A190656
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller, May 16 2011
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STATUS
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approved
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