id:A117523 - OEIS Search Results

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Triangular numbers for which the sum of the digits is an octagonal number.

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0, 1, 10, 1596, 2775, 3486, 3828, 4278, 4656, 5565, 6555, 7626, 8256, 9453, 14196, 15753, 16653, 17391, 18336, 21945, 22791, 23871, 24753, 28920, 32385, 34716, 37128, 38226, 39621, 40755, 42195, 43365, 44850, 46056, 51681, 54615, 56280 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`1596 is in the sequence because (1) it is a triangular number, and (2) the sum of its digits 1+5+9+6=21 is a octagonal number.`
	CROSSREFS	`Cf. A000217, A000567.` `Sequence in context: A013368 A133216 A099128 this_sequence A024138 A004821 A114776` `Adjacent sequences: A117520 A117521 A117522 this_sequence A117524 A117525 A117526`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 30 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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