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Search: id:A045979
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| A045979 |
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Bernoulli number B_{2n} has denominator 6. |
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+0
12
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| 1, 7, 13, 17, 19, 31, 37, 43, 47, 49, 59, 61, 67, 71, 73, 79, 91, 97, 101, 103, 107, 109, 127, 133, 137, 139, 149, 151, 157, 163, 167, 169, 181, 193, 197, 199, 211, 217, 223, 227, 229, 241, 247, 257, 259, 263, 269, 271, 277, 283, 289
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OFFSET
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1,2
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COMMENT
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All primes in A053176 are in the sequence. If n is in the sequence, its factorization contains only primes in A053176. - Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 19 2002
B(2n) has denominator 6 iff (n^2-1)*B(2n) is an integer. - Benoit Cloitre, Feb 15 2004
Subsequence of A156543. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 10 2009]
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REFERENCES
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B. C. Berndt, Ramanujan's Notebooks Part IV, Springer-Verlag, see p. 76.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Index entries for sequences related to Bernoulli numbers.
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FORMULA
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a(n) seems to be asymptotic to c*n 5<c<6 - Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 19 2002
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CROSSREFS
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Cf. A051222.
Sequence in context: A097959 A156543 A090863 this_sequence A079699 A053176 A032669
Adjacent sequences: A045976 A045977 A045978 this_sequence A045980 A045981 A045982
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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