OFFSET
1,3
COMMENTS
All terms correspond to verified primes, that is, not merely probable primes.
a(14) > 2*10^5.
EXAMPLE
4 is in this sequence because 6 * 7^4 + 1 = 14407, which is prime.
MATHEMATICA
Select[Range[0, 200000], PrimeQ[6 * 7^# + 1] &]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Nov 14 2014
STATUS
approved