id:A087671 - OEIS Search Results

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Number of subsets S of {0,1,2,...,n-1} which are idempotent under squaring modulo n, where S*S mod n = {x*y mod n|x,y in S}.

+0
1

2, 4, 6, 8, 8, 27, 10, 26, 18, 43, 10, 146, 14, 59, 107, 114, 12, 184, 14, 406, 142, 59 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`{4} is one of the a(6)=27 idempotent (mod 6) subsets of {0,1,2,3,4,5}, since {4}*{4}={16 mod 6}={4}.`
	CROSSREFS	`Sequence in context: A060659 A063199 A062355 this_sequence A088308 A134488 A085492` `Adjacent sequences: A087668 A087669 A087670 this_sequence A087672 A087673 A087674`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Sep 26 2003`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.