
COMMENTS

Sequence is the intersection of two sequences: n such that n! + 257 is prime (i.e., 3, 4, 6, 7, 8, 18, 22, 35, 93, 97, 125, 137, 153, ...) and n such that abs(n!  257) is prime (i.e., 3, 4, 5, 6, 7, 8, 15, 18, 20, 25, 28, 51, 79, 80, ...).  Jon E. Schoenfield, Mar 12 2017
Sequence is complete since there no other terms up to 256 included, and then n! + 257 and abs(n!  257) are both multiples of 257 for n>=257.  Michel Marcus, Mar 12 2017
