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Search: id:A071566
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| A071566 |
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Numbers n such that x^n + x^(n-1) + x^(n-2) + ... + x + 1 is irreducible over GF(11). |
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+0
2
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| 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; listen)
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OFFSET
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1,1
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FORMULA
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Numbers so far are A019339(n+1) - 1. - Ralf Stephan, Dec 26 2004
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MATHEMATICA
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Do[s = Sum[x^i, {i, 0, n}]; If[ ToString[ Factor[s, Modulus -> 11]] == ToString[s], Print[n]], {n, 0, 800, 2}]
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CROSSREFS
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Cf. A071642.
Sequence in context: A107607 A102975 A120300 this_sequence A113802 A057123 A134833
Adjacent sequences: A071563 A071564 A071565 this_sequence A071567 A071568 A071569
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 22 2002
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