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Search: id:A073409
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| A073409 |
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Least k such that k!*B(2n) is an integer where B(2n) denotes the 2n-th Bernoulli number. |
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+0
2
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| 3, 5, 7, 5, 11, 13, 3, 17, 19, 11, 23, 13, 3, 29, 31, 17, 3, 37, 3, 41, 43, 23, 47, 17, 11, 53, 19, 29, 59, 61, 3, 17, 67, 5, 71, 73, 3, 5, 79, 41, 83, 43, 3, 89, 31, 47, 3, 97, 3, 101, 103, 53, 107, 109, 23, 113, 7, 59, 3, 61, 3, 5, 127, 17, 131, 67, 3, 137, 139, 71, 3, 73, 3, 149
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Largest prime factor of A002445, the denominator of the Bernoulli number B(2n). - T. D. Noe (noe(AT)sspectra.com), Mar 31 2004
a((p-1)/2) = p, where p is odd prime. All odd primes appear in this sequence. The very first appearance of odd prime p is a((p-1)/2). - Alexander Adamchuk (alex(AT)kolmogorov.com), Jul 31 2006
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MATHEMATICA
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Table[FactorInteger[Denominator[BernoulliB[2n]]][[ -1, 1]], {n, 100}]
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CROSSREFS
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Cf. A005097.
Sequence in context: A141574 A141261 A077129 this_sequence A151548 A071581 A084393
Adjacent sequences: A073406 A073407 A073408 this_sequence A073410 A073411 A073412
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 23 2002
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