A135279 - OEIS

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A135279

Smallest k such that x^k is (+1 or -1) mod p for all nonzero x relatively prime to p, where p=prime(n)=A000040(n).

1, 2, 2, 3, 5, 6, 8, 9, 11, 14, 15 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..11.`
	FORMULA	`maybe a(1)=1 a(2)=2, a(n)=f(n-1) where f is A005097.`
	EXAMPLE	`a(6)=6 because X^6 (mod 13) is +-1.`
	CROSSREFS	`Cf. A002322, A005097.` `Sequence in context: A236970 A060966 A172993 * A035631 A050046 A052337` `Adjacent sequences: A135276 A135277 A135278 * A135280 A135281 A135282`
	KEYWORD	`more,nonn`
	AUTHOR	`Masahiko Shin, Dec 02 2007`
	EXTENSIONS	`Edited by R. J. Mathar, Jan 30 2008`
	STATUS	`approved`

Last modified May 25 05:56 EDT 2017. Contains 287012 sequences.