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A091225 Characteristic function of A014580: 1 if the n-th GF(2)[X] polynomial is irreducible, 0 otherwise. 50
0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..101.

A. Karttunen, Scheme-program for computing this sequence

Index entries for characteristic functions

Index entries for sequences operating on GF(2)[X]-polynomials

PROG

(PARI) a(n) = polisirreducible(Pol(binary(n))*Mod(1, 2)); \\ Michel Marcus, Nov 11 2017

CROSSREFS

a(n) = A010051(A091203(n)) = A010051(A091205(n)). Partial sums give A091226. Cf. A091227. Complementary to A091247.

Sequence in context: A262684 A287382 A074290 * A175337 A285031 A327222

Adjacent sequences:  A091222 A091223 A091224 * A091226 A091227 A091228

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 03 2004

STATUS

approved

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Last modified November 22 16:31 EST 2019. Contains 329396 sequences. (Running on oeis4.)