id:A117305 - OEIS Search Results

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

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0, 1, 10, 66, 435, 561, 741, 903, 1128, 1326, 1830, 2145, 2415, 3081, 5151, 6105, 7140, 10731, 11325, 12090, 12720, 13530, 15051, 19110, 20910, 30135, 31125, 33411, 50403, 53301, 70500, 81003, 100128, 130305, 142311, 180300, 200028, 220116 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`66 is in the sequence because (1) it is a triangular number and (2) the sum of its digits 6+6=12 is a pentagonal number.`
	CROSSREFS	`Cf. A000217, A000326.` `Sequence in context: A026853 A033504 A163615 this_sequence A108275 A086443 A026844` `Adjacent sequences: A117302 A117303 A117304 this_sequence A117306 A117307 A117308`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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