1,1

a(n) = A100856(k) = A100857(k) for some k.

Primes of form n! + n + 1 (n integer) - Paolo P. Lava (ppl(AT)spl.at), May 22 2006

Subset of A073309. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 02 2008]

Sequence in context: A154552 A100857 A100856 this_sequence A162262 A151373 A035410

Adjacent sequences: A100855 A100856 A100857 this_sequence A100859 A100860 A100861

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 20 2004