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A152777
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7 times heptagonal numbers: 7*n*(5*n-3)/2.
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1
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0, 7, 49, 126, 238, 385, 567, 784, 1036, 1323, 1645, 2002, 2394, 2821, 3283, 3780, 4312, 4879, 5481, 6118, 6790, 7497, 8239, 9016, 9828, 10675, 11557, 12474, 13426, 14413, 15435, 16492, 17584, 18711, 19873, 21070, 22302, 23569
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| 7 times 7-gonal numbers.
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FORMULA
| a(n) = (35*n^2 - 21*n)/2 = A000566(n)*7.
a(n) = a(n-1)+35*n-28 (with a(0)=0). [From Vincenzo Librandi, Dec 15 2010]
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MATHEMATICA
| s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 7, 8!, 35}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 03 2009]
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CROSSREFS
| Cf. A000566.
Sequence in context: A043131 A082701 A044145 * A003530 A163827 A206989
Adjacent sequences: A152774 A152775 A152776 * A152778 A152779 A152780
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Dec 13 2008
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