login
A270818
Prime numbers of the form (2^k + k^2)/3.
1
19, 59, 43787, 11185019, 2932031008019, 768614336404565891, 3148244321913096810907, 1177898043185589553055531667161945677218322597917079305414404134195099211
OFFSET
1,1
COMMENTS
The corresponding values of k are 5, 7, 17, 25, 43, 61, 73, 241, 739, 833, 1297, 1981, 4211, 4501, 7739, 8141, 24965, ... - Amiram Eldar, Mar 07 2020
LINKS
MATHEMATICA
Select[Table[(2^n + n^2)/3, {n, 1, 1000}], PrimeQ]
PROG
(PARI) forstep(n=5, 1e3, [2, 4], if(isprime(t=(2^n+n^2)/3), print1(t", "))) \\ Charles R Greathouse IV, Apr 07 2016
CROSSREFS
Sequence in context: A139981 A235705 A171247 * A206426 A211145 A338990
KEYWORD
nonn
AUTHOR
STATUS
approved