id:A092584 - OEIS Search Results

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Numbers n such that sigma(phi(n))-phi(sigma(n)) is divisible by n, that is A033632[n]/n is an integer.

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1, 5, 9, 157, 225, 242, 516, 729, 3872, 13932, 14406, 17672, 18225, 20124, 21780, 29262, 29616, 45996, 65025, 76832, 92778, 95916, 106092, 106308, 114630, 114930, 121872, 125652, 140130, 140625, 145794, 149124, 160986, 179562, 185100, 234876 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`Includes but is not identical with A033632.` `Below 10^7 only a(2)=5 and a(4)=157 give A033632(n)/n nonzero.`
	CROSSREFS	`Cf. A033632, A092585-A092588.` `Cf. A065395.` `Sequence in context: A124421 A098097 A097397 this_sequence A002657 A046093 A097086` `Adjacent sequences: A092581 A092582 A092583 this_sequence A092585 A092586 A092587`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Mar 01 2004`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research