OFFSET
1,2
COMMENTS
The next terms are > 239044.
Contains exactly the halved even terms of A157007.
EXAMPLE
For k = 22, 4^22 + 27 = 17592186044443 is prime.
MATHEMATICA
Select[Range[0, 250000], PrimeQ[4^# + 27] &]
PROG
(Magma) [n: n in [0..700] | IsPrime(4^n+27)]; // Vincenzo Librandi, Oct 06 2015
(PARI) for(n=1, 1e3, if(isprime(4^n+3^3), print1(n", "))) \\ Altug Alkan, Oct 06 2015
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Oct 05 2015
EXTENSIONS
a(32) derived from A157007 by Elmo R. Oliveira, Nov 28 2023
STATUS
approved