OFFSET
2,1
COMMENTS
Generalized Fermat numbers of the form b^(2^n) + k
PROG
(PARI) for(b=2, 30, if(b%2==0, a=1, a=0); forstep(k=a, 10^8, 2, i=0; for(n=0, 6, m=b^2^n+k; if(isprime(m), i++; if(i>6, print1(k, ", "); next(3))))))
CROSSREFS
KEYWORD
nonn
AUTHOR
Robin Garcia, May 10 2013
STATUS
approved