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A071522
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Numbers n such that x^n + x^(n-1) + x^(n-2) + ... + x + 1 is irreducible over GF(5).
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0
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2, 6, 16, 22, 36, 42, 46, 52, 72, 82, 96, 102, 106, 112, 136, 156, 166, 172, 192, 196, 222, 226, 232, 256, 262, 276, 282, 292, 306, 316, 346, 352, 372, 382, 396, 432, 442, 462, 466, 502, 522, 546, 556, 562, 576, 586, 592, 606, 612, 616, 646, 652, 672, 676
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| Do[s = Sum[x^i, {i, 0, n}]; If[ ToString[ Factor[s, Modulus -> 5]] == ToString[s], Print[n]], {n, 0, 700, 2}]
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CROSSREFS
| Cf. A071642.
Sequence in context: A080622 A082374 A085226 * A192532 A160620 A005996
Adjacent sequences: A071519 A071520 A071521 * A071523 A071524 A071525
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 22 2002
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