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A057481 Numbers n such that x^n + x^11 + 1 is irreducible over GF(2). 1
2, 9, 15, 17, 18, 36, 60, 63, 84, 95, 98, 135, 156, 170, 186, 218, 540, 641, 660 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

Do[ If[ ToString[ Factor[ x^n + x^11 + 1, Modulus -> 2 ] ] == ToString[ x^n + x^11 + 1 ], Print[ n ] ], {n, 0, 750} ]

CROSSREFS

Cf. A002475.

Sequence in context: A178849 A217367 A076208 * A083288 A272044 A304803

Adjacent sequences:  A057478 A057479 A057480 * A057482 A057483 A057484

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 27 2000

STATUS

approved

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Last modified March 18 17:51 EDT 2019. Contains 321292 sequences. (Running on oeis4.)