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Search: id:A089644
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| A089644 |
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Numbers n such that 7 divides the numerator of B(2n) where B(2n) = the 2n-th Bernoulli number. |
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+0
2
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| 7, 14, 28, 35, 49, 56, 70, 77, 91, 98, 112, 119, 133, 140, 154, 161, 175, 182, 196, 203, 217, 224, 238, 245, 259, 266, 280, 287, 301, 308, 322, 329, 343, 350, 364, 371, 385, 392, 406, 413, 427, 434, 448, 455, 469, 476, 490, 497, 511, 518, 532, 539, 553, 560
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OFFSET
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1,1
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COMMENT
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Except for the first term, a(n)=21*n-a(n-1), (with a(1)=14) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
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FORMULA
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a(n)=7*A001651(n)
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EXAMPLE
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for n=2, a(2)=21*2-14=28; n=3, a(3)=21*3-28=35; n=4, a(4)=21*4-35=49 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
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CROSSREFS
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Cf. A073216.
Sequence in context: A104599 A115874 A083495 this_sequence A115815 A071711 A033895
Adjacent sequences: A089641 A089642 A089643 this_sequence A089645 A089646 A089647
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 01 2004
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