A071565 - OEIS

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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

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

FORMULA

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

CROSSREFS

Cf. A071642.

Cf. A019337. - Joerg Arndt, Apr 17 2020

Sequence in context: A117099 A026180 A109274 * A233741 A310340 A285570

Adjacent sequences: A071562 A071563 A071564 * A071566 A071567 A071568

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Jun 22 2002

STATUS

approved