id:A116015 - OEIS Search Results

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n+sigma(n)+sigma(sigma(n)) is a triangular number.

+0
5

1, 9, 43, 109, 119, 161, 175, 192, 232, 490, 843, 1050, 1162, 1242, 1635, 1959, 2113, 2859, 2935, 3008, 3174, 3469, 3717, 4165, 4173, 4761, 4839, 4876, 5200, 6111, 6423, 6468, 8008, 8480, 9064, 9523, 9603, 11143, 11197, 11353, 11557, 11773 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`6111+sigma(6111)+sigma(sigma(6111))=T(286).`
	CROSSREFS	`Cf. A116012, A116013, A116014.` `Adjacent sequences: A116012 A116013 A116014 this_sequence A116016 A116017 A116018` `Sequence in context: A084899 A074443 A007227 this_sequence A110125 A034194 A075206`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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