A090817 - OEIS

A090817

a(n)=numerator(B(2*prime(n))) where prime(n)=n-th prime and B(k) denotes the k-th Bernoulli number.

%I #5 Mar 30 2012 18:39:22

%S 1,1,5,7,854513,8553103,2577687858367,2929993913841559,

%T 596451111593912163277961,84483613348880041862046775994036021,

%U 12300585434086858541953039857403386151

%N a(n)=numerator(B(2*prime(n))) where prime(n)=n-th prime and B(k) denotes the k-th Bernoulli number.

%C a(1)=1 (instead of -1)

%o (PARI) a(n)=numerator(bernfrac(2*prime(n)))

%K nonn

%O 1,3

%A _Benoit Cloitre_, Feb 11 2004