id:A117312 - OEIS Search Results

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Triangular numbers for which the sum of the digits is a heptagonal number.

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0, 1, 10, 378, 666, 990, 1485, 1953, 2556, 2628, 4095, 4851, 4950, 6903, 9045, 9180, 10296, 11628, 11781, 14535, 14706, 16290, 19503, 19701, 21528, 23436, 25425, 27261, 29403, 31626, 33930, 34191, 36315, 39060, 41328, 41616, 44253, 52326 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`378 is in the sequence because (1) it is a triangular number, and (2) the sum of its digits 3+7+8=18 is a heptagonal number.`
	CROSSREFS	`Cf. A000217, A000566.` `Adjacent sequences: A117309 A117310 A117311 this_sequence A117313 A117314 A117315` `Sequence in context: A051790 A119547 A117797 this_sequence A000591 A131312 A055733`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006`

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.

AT&T Labs Research