A125559 Numbers k such that 2k^3 + 7 is prime. For k >= 8, bases in which 2007 is prime.

0, 2, 3, 5, 6, 8, 12, 17, 20, 26, 27, 32, 33, 36, 38, 41, 47, 50, 60, 65, 72, 75, 78, 87, 101, 111, 122, 123, 135, 137, 146, 152, 156, 162, 165, 173, 177, 188, 191, 195, 197, 221, 243, 246, 261, 267, 272, 291, 303, 311, 312, 321, 323, 330, 332, 333, 338, 362, 365

Offset

1,2

Links

Table of n, a(n) for n=1..59.

Mathematica

Select[Range[0, 365], PrimeQ[2#^3+7]&] (* James C. McMahon, Dec 18 2024 *)

Prog

(PARI) is(n)=isprime(2*n^3+7) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A002243 A094763 A338916 * A331865 A087360 A111501

Adjacent sequences: A125556 A125557 A125558 * A125560 A125561 A125562

Keyword

base,nonn,easy

Author

Zak Seidov, Jan 01 2007

Status

approved