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A007584 9-gonal (or enneagonal) pyramidal numbers: n(n+1)(7n-4)/6.
(Formerly M4695)
+0
5
0, 1, 10, 34, 80, 155, 266, 420, 624, 885, 1210, 1606, 2080, 2639, 3290, 4040, 4896, 5865, 6954, 8170, 9520, 11011, 12650, 14444, 16400, 18525, 20826, 23310, 25984, 28855, 31930 (list; graph; listen)
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.


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