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A071566 Numbers n such that x^n + x^(n-1) + x^(n-2) + ... + x + 1 is irreducible over GF(11). 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Numbers so far are A019339(n+1) - 1. - Ralf Stephan, Dec 26 2004

MATHEMATICA

Do[s = Sum[x^i, {i, 0, n}]; If[ ToString[ Factor[s, Modulus -> 11]] == ToString[s], Print[n]], {n, 0, 800, 2}]

CROSSREFS

Cf. A071642.

Sequence in context: A176888 A114974 A298001 * A295821 A113802 A274890

Adjacent sequences:  A071563 A071564 A071565 * A071567 A071568 A071569

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Jun 22 2002

STATUS

approved

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Last modified January 28 22:31 EST 2020. Contains 331328 sequences. (Running on oeis4.)