id:A117309 - OEIS Search Results

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

+0
1

0, 1, 6, 10, 15, 78, 105, 231, 276, 465, 528, 780, 861, 1176, 1275, 1653, 1770, 2211, 2346, 2850, 3003, 3570, 3741, 4371, 4560, 5253, 5460, 5995, 6216, 6441, 7260, 7503, 11175, 12246, 12561, 14028, 14878, 15225, 17205, 17578, 20301, 20706, 21155 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`105 is in the sequence because (1) it is a triangular number, and (2) the sum of its digits 1+0+5=6 is a hexagonal number.`
	CROSSREFS	`Cf. A000217, A000384.` `Sequence in context: A020159 A048017 A048078 this_sequence A108936 A117002 A131501` `Adjacent sequences: A117306 A117307 A117308 this_sequence A117310 A117311 A117312`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006`

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

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