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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, 879, 1388, 1820, 1866, 1943, 2055, 2388, 3423, 3983 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

PROG

(PARI) is(k) = polisirreducible(Mod(1, 2)*(x^k + x^11 + 1)); \\ Jinyuan Wang, Apr 15 2020

CROSSREFS

Cf. A002475.

Sequence in context: A178849 A217367 A076208 * A083288 A272044 A304803

Adjacent sequences:  A057478 A057479 A057480 * A057482 A057483 A057484

KEYWORD

nonn,more

AUTHOR

Robert G. Wilson v, Sep 27 2000

EXTENSIONS

a(20)-a(28) from Jinyuan Wang, Apr 15 2020

STATUS

approved

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Last modified June 24 08:43 EDT 2021. Contains 345416 sequences. (Running on oeis4.)