A239416 Numbers n such that n^8-8 is prime.

3, 7, 19, 39, 73, 75, 101, 107, 145, 147, 171, 213, 235, 247, 263, 285, 319, 353, 359, 369, 399, 443, 445, 521, 523, 557, 613, 675, 693, 707, 733, 781, 791, 805, 815, 829, 837, 879, 927, 943, 961, 999, 1033, 1097, 1103, 1109, 1129, 1137, 1141, 1155, 1157

Offset: 1

Author

Derek Orr, Mar 17 2014

Keywords

• nonn

Comments

Note that all the numbers in this sequence are odd.

Examples

			3^8-8 = 6553 is prime. Thus, 3 is a member of this sequence.
		

Crossrefs

Cf. A028870, A153974, A239413, A239414, A239415, A239417, A239418, A239345.

Programs

Mathematica

Select[Range[3,1200,2],PrimeQ[#^8-8]&] (* Harvey P. Dale, Jun 27 2014 *)

PARI

is(n)=isprime(n^8-8) \\ Charles R Greathouse IV, Feb 20 2017

Python

import sympy
from sympy import isprime
{print(n) for n in range(10**4) if isprime(n**8-8)}