id:A115918 - OEIS Search Results

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Numbers n such that sigma(n)-phi(n) is a 4th power.

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1, 15, 560, 570, 1071, 1102, 1185, 2035, 2071, 2128, 2185, 3007, 3215, 4087, 4487, 4584, 5406, 9204, 10727, 13912, 16675, 17951, 17970, 19127, 20553, 24288, 24887, 28247, 28290, 30216, 34951, 35807, 35985, 38551, 40967, 44472, 44951, 55247 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`sigma(16675)-phi(16675)=10000=10^4.`
	CROSSREFS	`Cf. A056917, A062385.` `Sequence in context: A002403 A077206 A061174 this_sequence A110840 A012178 A012229` `Adjacent sequences: A115915 A115916 A115917 this_sequence A115919 A115920 A115921`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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