OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..4400
EXAMPLE
a(1) = 1 because 8*1 + 81 = 89 is prime.
a(2) = 4 because 8*4^3 + 81 = 593 is prime.
MATHEMATICA
Select[Range[500], PrimeQ[8 #^3 + 81] &]
PROG
(Magma) [n: n in [0..500] |IsPrime(8*n^3+81)];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jun 07 2017
STATUS
approved