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Search: id:A071565
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| A071565 |
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Numbers n such that x^n + x^(n-1) + x^(n-2) + ... + x + 1 is irreducible over GF(7). |
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+0
1
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| 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
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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Do[s = Sum[x^i, {i, 0, n}]; If[ ToString[ Factor[s, Modulus -> 7]] == ToString[s], Print[n]], {n, 0, 800, 2}]
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CROSSREFS
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Cf. A071642.
Sequence in context: A117099 A026180 A109274 this_sequence A109096 A079283 A107960
Adjacent sequences: A071562 A071563 A071564 this_sequence A071566 A071567 A071568
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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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