A165823 - OEIS

%I #2 Mar 30 2012 18:52:03

%S 1,2,6,24,30,1440,42,120960,30,7257600,66,958003200,2730,

%T 5230697472000,6,62768369664000,510,64023737057280000

%N Large denominators of Bernoulli numbers. Mix A002445, 2*A141421 .

%C 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.

%K nonn,uned

%O 0,2

%A _Paul Curtz_, Sep 28 2009