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A003560 Least number m such that 4^m = +- 1 mod 4n + 1. 0
1, 3, 3, 2, 3, 5, 7, 5, 9, 5, 6, 21, 13, 9, 15, 3, 11, 9, 15, 27, 4, 11, 5, 12, 25, 6, 9, 7, 6, 55, 25, 7, 9, 17, 23, 7, 37, 12, 13, 33, 10, 39, 43, 29, 45, 9, 9, 24, 49, 33, 5, 45, 35, 15, 12, 30, 19, 29, 39, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..59.

CROSSREFS

Sequence in context: A261735 A129309 A268931 * A262212 A123676 A122775

Adjacent sequences:  A003557 A003558 A003559 * A003561 A003562 A003563

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 25 01:17 EDT 2018. Contains 315360 sequences. (Running on oeis4.)