The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A117519 Triangular numbers n divisible by the number of triangular numbers smaller than n. 0
 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; text; internal format)
 OFFSET 1,2 COMMENTS The number of triangular numbers smaller than n can be found in sequence A002024 because n appears n times. LINKS 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: A335267 A242454 A161777 * A091012 A241988 A058008 Adjacent sequences:  A117516 A117517 A117518 * A117520 A117521 A117522 KEYWORD nonn AUTHOR Luc Stevens (lms022(AT)yahoo.com), Apr 28 2006 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 30 12:08 EDT 2021. Contains 346359 sequences. (Running on oeis4.)