OFFSET
1,3
COMMENTS
Primes found and proved by PrimeForm.
All terms correspond to verified primes, that is, not merely probable primes. - Robert Price, Jan 16 2015
a(18) > 3*10^5. - Robert Price, Jan 16 2015
MATHEMATICA
Select[Range[0, 10000], PrimeQ[6*5^# + 1] &] (* Robert Price, Jan 16 2015 *)
PROG
(PARI) is(n)=ispseudoprime(6*5^n+1) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Rick L. Shepherd, Aug 04 2008
EXTENSIONS
a(17) from Robert Price, Jan 16 2015
STATUS
approved