id:A117519 - OEIS Search Results

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Triangular numbers n divisible by the number of triangular numbers smaller than n.

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0, 6, 15, 28, 36, 55, 105, 120, 210, 231, 378, 496, 528, 666, 990, 1540, 2145, 2556, 2628, 3081, 4095, 4186, 5460, 5565, 6105, 6555, 7140, 8128, 8256, 9316, 11628, 14706, 17955, 19900, 20100, 22155, 23436, 25200, 26565, 26796, 31878, 32131 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The number of triangular numbers smaller than n can be found in sequence A002024 because n appears n times.`
	EXAMPLE	`2145 is in the sequence because (1) it is a triangular number, (2) the number of triangular numbers smaller than 2145 is 11, and (3) 2145 is divisible by 11.`
	CROSSREFS	`Cf. A002024, A000217.` `Sequence in context: A072257 A140091 A063525 this_sequence A091012 A058008 A094142` `Adjacent sequences: A117516 A117517 A117518 this_sequence A117520 A117521 A117522`
	KEYWORD	`nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 28 2006`

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

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