id:A055574 - OEIS Search Results

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n satisfying sigma(n+1) = sigma(n-1).

+0
4

34, 55, 285, 367, 835, 849, 919, 1241, 1505, 2911, 2914, 3305, 4149, 4188, 6111, 6903, 7170, 7913, 9360, 10251, 10541, 12566, 15086, 17273, 17815, 19005, 19689, 21411, 21462, 24882, 25020, 26610, 28125, 30593, 30789, 31485, 38211, 38983 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`sigma(34-1) = 48 = sigma(34+1), so 34 is a term of the sequence.`
	MATHEMATICA	`Select[Range[10^5], DivisorSigma[1, # + 1] == DivisorSigma[1, # - 1] &]`
	CROSSREFS	`Essentially the same as A007373.` `Sequence in context: A092888 A051969 A067243 this_sequence A103558 A103686 A108610` `Adjacent sequences: A055571 A055572 A055573 this_sequence A055575 A055576 A055577`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 12 2002`

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

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