OFFSET
1,1
PROG
(PARI) isok(p) = {for (n=1, 13, if (! isprime(subst(x^2+x+p, x, n)), return (0)); ); 1; } \\ Michel Marcus, Jan 13 2015
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Zak Seidov, Jan 05 2015
STATUS
approved