A124787 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A124787

Primes p such that p divides the Wolstenholme number A007408((p+1)/2).

%I #4 Mar 31 2012 13:20:33

%S 3,11,17,89,2305777

%N Primes p such that p divides the Wolstenholme number A007408((p+1)/2).

%o (PARI) {s=0;h=1;forprime(p=3,2400000,q=(p+1)/2;s=s+sum(k=h,q,1/k^3);if(numerator(s)%p==0,print1(p,","));h=q+1)} - Klaus Brockhaus, Nov 10 2006

%Y Cf. A007408 = Wolstenholme numbers.

%K more,nonn

%O 1,1

%A _Alexander Adamchuk_, Nov 07 2006

%E a(5) from _Klaus Brockhaus_, Nov 10 2006