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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). 0
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

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Last modified November 18 05:08 EST 2017. Contains 294853 sequences.