A071566 Numbers k such that x^k + x^(k-1) + x^(k-2) + ... + x + 1 is irreducible over GF(11).

2, 12, 16, 22, 28, 30, 40, 46, 58, 66, 70, 72, 100, 102, 108, 148, 162, 172, 178, 196, 222, 232, 250, 276, 280, 292, 330, 366, 372, 382, 418, 442, 460, 462, 466, 486, 498, 556, 568, 586, 592, 598, 600, 612, 618, 642, 646, 672, 676, 682, 700, 718, 760, 768

Offset: 1

Author

Robert G. Wilson v, Jun 22 2002

Keywords

• easy
• nonn

Crossrefs

Cf. A071642.

Formula

a(n) = A019339(n+1) - 1. - Ralf Stephan, Dec 26 2004