OFFSET
2,3
COMMENTS
a(n) = a(n+1) for n=2, 8, 14, 20, 24, 26, 32, 34, 38, 44, 48, 50, 54, 56, 62, 64, 68, 74, 76, 80, 84, 86, 90, 92, 94, 98...it seems this is true for n=6k+2, n=10k+24, ...
PROG
(PARI) a(n)=(1/2)*prod(i=1, n, i^isprime(i))*sum(k=1, n, bernfrac(k)*binomial(2*k, k))
CROSSREFS
KEYWORD
easy,sign,changed
AUTHOR
Benoit Cloitre, Aug 19 2002
STATUS
approved