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A060544 Centered 9-gonal (or nonagonal) numbers. Every third triangular number, starting with a(1)=1. +0
15
1, 10, 28, 55, 91, 136, 190, 253, 325, 406, 496, 595, 703, 820, 946, 1081, 1225, 1378, 1540, 1711, 1891, 2080, 2278, 2485, 2701, 2926, 3160, 3403, 3655, 3916, 4186, 4465, 4753, 5050, 5356, 5671, 5995, 6328, 6670, 7021, 7381, 7750, 8128, 8515, 8911, 9316 (list; graph; listen)
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.


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