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A057477 Numbers n such that x^n + x^7 + 1 is irreducible over GF(2). 1
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; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

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: A004793 A031132 A322165 * A249666 A113887 A103000

Adjacent sequences:  A057474 A057475 A057476 * A057478 A057479 A057480

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 27 2000

STATUS

approved

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Last modified February 15 16:25 EST 2019. Contains 320136 sequences. (Running on oeis4.)