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A117519
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Triangular numbers n divisible by the number of triangular numbers smaller than n.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The number of triangular numbers smaller than n can be found in sequence A002024 because n appears n times.
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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.
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CROSSREFS
| Cf. A002024, A000217.
Sequence in context: A165454 A063525 A161777 * A091012 A058008 A094142
Adjacent sequences: A117516 A117517 A117518 * A117520 A117521 A117522
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KEYWORD
| nonn
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AUTHOR
| Luc Stevens (lms022(AT)yahoo.com), Apr 28 2006
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