id:A098271 - OEIS Search Results

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Nonprime numbers n such that phi(n) divides (n^2 -1), where phi(n) (A000010) is Euler's totient function.

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1, 15, 35, 65, 91, 255, 377, 559, 1295, 2001, 2059, 2431, 4081, 7743, 8911, 10745, 12851, 22791, 26335, 39689, 51271, 61699, 65535, 73151, 95201, 97681, 112897, 114191, 139231, 150177, 184255, 216545, 229503, 286937, 294785, 296191, 334369 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	MATHEMATICA	`Select[ Range[ 335000], Mod[ #^2 - 1, EulerPhi[ # ]] == 0 && !PrimeQ[ # ] &]`
	CROSSREFS	`Cf. A000010, A097605.` `Sequence in context: A146688 A146656 A160497 this_sequence A082663 A109068 A061367` `Adjacent sequences: A098268 A098269 A098270 this_sequence A098272 A098273 A098274`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet and Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 01 2004`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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