A057477 - OEIS

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A057477

Numbers n such that x^n + x^7 + 1 is irreducible over GF(2).

1, 3, 4, 6, 10, 12, 15, 18, 21, 25, 31, 34, 42, 52, 55, 57, 105, 127, 172, 210, 220, 300, 393, 420, 441, 492 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	MATHEMATICA	`Do[ If[ ToString[ Factor[ x^n + x^7 + 1, Modulus -> 2 ] ] == ToString[ x^n + x^7 + 1 ], Print[ n ] ], {n, 0, 750} ]`
	CROSSREFS	`Cf. A002475.` `Sequence in context: A082694 A004793 A031132 * A113887 A103000 A074321` `Adjacent sequences: A057474 A057475 A057476 * A057478 A057479 A057480`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 27 2000`

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Last modified February 14 07:52 EST 2012. Contains 205597 sequences.