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Search: id:A141056
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| A141056 |
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A version for denominators of Bernoulli numbers : 1, A027760. |
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+0
10
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| 1, 2, 6, 2, 30, 2, 42, 2, 30, 2, 66, 2, 2730, 2, 6, 2, 510, 2, 798, 2
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The denominators of the Bernoulli numbers for n>0. B_n sequence begins 1, -1/2, 1/6, 0/2, -1/30, 0/2, 1/42, 0/2, ... This is an alternative version of A027642 suggested by the theorem of Clausen. [From Peter Luschny (peter(AT)luschny.de), Apr 29 2009]
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REFERENCES
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Clausen, Thomas, "Lehrsatz aus einer Abhandlung Ueber die Bernoullischen Zahlen", Astr. Nachr. 17 (1840), 351-352. [From Peter Luschny (peter(AT)luschny.de), Apr 29 2009]
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LINKS
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Wikipedia, Bernoulli number [From Peter Luschny (peter(AT)luschny.de), Apr 29 2009]
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MAPLE
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Contribution from Peter Luschny (peter(AT)luschny.de), Apr 29 2009: (Start)
Clausen := proc(n) local S, i;
S := numtheory[divisors](n);
S := map(i->i+1, S);
S := select(isprime, S);
mul(i, i=S) end:
seq(Clausen(i), i=0..24); (End)
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CROSSREFS
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Cf. A027760, A027642. [From Peter Luschny (peter(AT)luschny.de), Apr 29 2009]
Adjacent sequences: A141053 A141054 A141055 this_sequence A141057 A141058 A141059
Sequence in context: A125032 A131980 A076743 this_sequence A027760 A140770 A141498
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KEYWORD
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nonn,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Aug 01 2008
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