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A165823 Large denominators of Bernoulli numbers. Mix A002445, 2*A141421 . 1
1, 2, 6, 24, 30, 1440, 42, 120960, 30, 7257600, 66, 958003200, 2730, 5230697472000, 6, 62768369664000, 510, 64023737057280000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

b(n)=a(2n+1)/a(2n) =2,4,48,2880,241920,145152,= 2*(1,2,24,1440,=1,2*A141421). Among other denominators, A027642,A141056,A164020. 2*A141421 is second bisection of A091137 which is linked to Bernoulli via A027760. See A160014,von Staudt-Clausen theorem.

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Sequence in context: A066332 A069141 A158977 * A263690 A137326 A163912

Adjacent sequences:  A165820 A165821 A165822 * A165824 A165825 A165826

KEYWORD

nonn,uned

AUTHOR

Paul Curtz, Sep 28 2009

STATUS

approved

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Last modified June 25 12:55 EDT 2019. Contains 324352 sequences. (Running on oeis4.)