OFFSET
1,3
COMMENTS
All terms correspond to verified primes, that is, not merely probable primes.
MATHEMATICA
Select[Range[0, 10000], PrimeQ[6*5^# - 1] &]
PROG
(Magma) [n: n in [0..2*10^3] | IsPrime(6*5^n-1)]; // Vincenzo Librandi, May 09 2015
(PARI) is(n)=ispseudoprime(6*5^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Robert Price, May 08 2015
EXTENSIONS
a(30) from Riley Fisher, Sep 20 2024
STATUS
approved