A091227 - OEIS

This site is supported by donations to The OEIS Foundation.

A091227

Inverse function of A014580: position in A014580 if the n-th GF(2)[X] polynomial is irreducible, 0 otherwise.

0, 1, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 5, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 9, 0, 0, 0, 10, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 13, 0, 14, 0, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 17, 0, 0, 0, 18, 0, 0, 0, 0, 0, 19, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	LINKS	`A. Karttunen, Scheme-program for computing this sequence.` `Index entries for sequences operating on GF(2)[X]-polynomials`
	FORMULA	`a(n) = A091225(n) * A091226(n).`
	CROSSREFS	`Inverse of A014580. a(n) = A049084(A091203(n)).` `Sequence in context: A174712 A127647 A140579 * A035444 A152489 A143655` `Adjacent sequences: A091224 A091225 A091226 * A091228 A091229 A091230`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (His-Firstname.His-Surname(AT)iki.fi), Jan 03 2004`

Content is available under The OEIS End-User License Agreement .

Last modified February 14 17:10 EST 2012. Contains 205644 sequences.