id:A090999 - OEIS Search Results

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Numbers n such that sigma(n)-n = pi(sigma(n)).

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1, 15, 21, 33, 23069, 42029, 148031, 209911 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Do[If[DivisorSigma[1, n]-n==PrimePi[DivisorSigma[1, n]], Print[n]], {n, 1, 10000}]`
	CROSSREFS	`Sequence in context: A127329 A043326 A079814 this_sequence A123912 A128279 A099611` `Adjacent sequences: A090996 A090997 A090998 this_sequence A091000 A091001 A091002`
	KEYWORD	`nonn`
	AUTHOR	`Naohiro Nomoto (n_nomoto(AT)mx2.et.tiki.ne.jp), Mar 01 2004`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.