A071565 Numbers k such that x^k + x^(k-1) + x^(k-2) + ... + x + 1 is irreducible over GF(7).

4, 10, 12, 16, 22, 40, 60, 66, 70, 78, 88, 96, 100, 106, 126, 150, 162, 172, 178, 210, 228, 238, 240, 256, 262, 268, 292, 346, 348, 358, 378, 396, 430, 432, 442, 460, 490, 498, 508, 520, 546, 576, 592, 598, 600, 630, 658, 676, 682, 732, 738, 742, 760, 772

Offset: 1

Author

Robert G. Wilson v, Jun 22 2002

Keywords

• easy
• nonn

Crossrefs

Cf. A071642.

Cf. A019337. - Joerg Arndt, Apr 17 2020

Formula

a(n) = A019337(n+1) - 1. - Joerg Arndt, Apr 17 2020