id:A116001 - OEIS Search Results

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sigma(n) - phi(n) gives a semiprime (A001358).

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6, 10, 18, 20, 22, 27, 34, 40, 49, 52, 58, 64, 68, 82, 98, 100, 118, 136, 142, 144, 148, 160, 162, 164, 202, 212, 214, 242, 243, 244, 274, 288, 289, 298, 320, 325, 333, 338, 343, 356, 358, 361, 382, 392, 394, 404, 436, 441, 454, 464, 478, 512, 538, 544, 548 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`sigma(100)-phi(100)=177=3*59`
	CROSSREFS	`Cf. A001358, A116017, A116000.` `Sequence in context: A049302 A020718 A048587 this_sequence A111617 A032641 A079471` `Adjacent sequences: A115998 A115999 A116000 this_sequence A116002 A116003 A116004`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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