id:A115907 - OEIS Search Results

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Numbers n such that sigma(n) plus the n-th prime is a triangular number.

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1, 2, 9, 13, 21, 80, 112, 129, 147, 225, 308, 349, 1063, 1282, 1300, 1635, 1880, 2686, 2956, 3517, 3759, 3907, 4058, 5025, 5196, 6742, 7606, 7708, 9244, 10154, 10596, 11259, 11719, 12687, 13167, 13599, 14081, 14624, 15937, 16437, 16766, 18289 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`sigma(1880)+p(1880)=20503=T(202).`
	CROSSREFS	`Cf. A115882, A115908.` `Sequence in context: A044904 A138946 A037385 this_sequence A063634 A163735 A144472` `Adjacent sequences: A115904 A115905 A115906 this_sequence A115908 A115909 A115910`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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