1,1

Primes of the form A004664(n) + 1. For n! + n^2 + 1 to be prime, n>1, it is necessary but not sufficient for n to be even. 74! + 74^2 + 1 is composite, with 108 digits; the next possible prime of the form n! + n^2 + 1 has n>75.

A000040 INTERSECTION {n! + n^2 + 1}.

Cf. A000040, A004664, A119448.

Sequence in context: A047024 A037843 A102604 this_sequence A000945 A126263 A030087

Adjacent sequences: A119659 A119660 A119661 this_sequence A119663 A119664 A119665

easy,nonn,less

Jonathan Vos Post (jvospost2(AT)yahoo.com), Jul 28 2006