id:A072989 - OEIS Search Results

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Numbers n such that the number of solutions to x^n==1 (mod n) 1<=x<=n is not equal to gcd(n,phi(n)).

+0
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20, 30, 40, 42, 52, 60, 66, 68, 70, 78, 80, 84, 90, 100, 102, 104, 110, 114, 116, 120, 126, 130, 132, 136, 138, 140, 148, 150, 154, 156, 160, 164, 168, 170, 171, 174, 180, 182, 186, 190, 198, 200, 204, 208, 210, 212, 220, 222, 228, 230, 232, 234, 238, 240 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Conjecture: limit of a(n)/n is zero.`
	CROSSREFS	`Sequence in context: A107714 A029721 A132067 this_sequence A166730 A109944 A108030` `Adjacent sequences: A072986 A072987 A072988 this_sequence A072990 A072991 A072992`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 21 2002`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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