0,3

Sequence A098845 lists indices of primes, i.e. a(n) prime <=> n=A098845(k) for some k.

(PARI) vector(99, n, 4^n-2^n-1)

Sequence in context: A022606 A072025 A098992 this_sequence A165791 A032166 A099532

Adjacent sequences: A156586 A156587 A156588 this_sequence A156590 A156591 A156592

sign

M. F. Hasler (MHasler(AT)univ-ag.fr), Feb 10 2009