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A277087
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a(0) = 1, a(n) = (denominator of the Bernoulli number B_{2n})/3, for n>=1.
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4
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1, 2, 10, 14, 10, 22, 910, 2, 170, 266, 110, 46, 910, 2, 290, 4774, 170, 2, 639730, 2, 4510, 602, 230, 94, 15470, 22, 530, 266, 290, 118, 18928910, 2, 170, 21574, 10, 1562, 46700290, 2, 10, 1106, 76670, 166, 1134770, 2, 20470, 90706, 470, 2, 1500590, 2, 11110, 1442, 530, 214, 69730570, 506, 557090, 14, 590, 2, 776085310
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OFFSET
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0,2
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COMMENTS
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All terms except a(0) are odd multiples of 2, by the von Staudt-Clausen theorem. See A002445 and A027642 for comments, references, and links.
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LINKS
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FORMULA
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MAPLE
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1, seq(denom(bernoulli(2*n))/3, n=1..100); # Robert Israel, Dec 16 2016
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MATHEMATICA
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Join[{1}, Denominator[BernoulliB[Range[2, 120, 2]]]/3]
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PROG
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CROSSREFS
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KEYWORD
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nonn,frac
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AUTHOR
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STATUS
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approved
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