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Search: id:A098140
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| 1, 63, 186, 370, 615, 921, 1288, 1716, 2205, 2755, 3366, 4038, 4771, 5565, 6420, 7336, 8313, 9351, 10450, 11610, 12831, 14113, 15456, 16860, 18325, 19851, 21438, 23086, 24795, 26565, 28396, 30288, 32241, 34255, 36330, 38466
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Similar to 21-gonal and 15-gonal numbers.
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EXAMPLE
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If n=2, 2*(61*2-59)/2 = 63
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MATHEMATICA
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Table[n(61n - 59)/2, {n, 1, 50}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 28 2006
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CROSSREFS
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Cf. A051873, A051867.
Sequence in context: A044395 A044776 A077263 this_sequence A008895 A008874 A045112
Adjacent sequences: A098137 A098138 A098139 this_sequence A098141 A098142 A098143
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Oct 25 2004
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 28 2006
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