A117305 - OEIS

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A117305

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

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; refs; listen; history; internal format)

	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: A177452 A033504 A163615 * A108275 A086443 A172066` `Adjacent sequences: A117302 A117303 A117304 * A117306 A117307 A117308`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.