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A153797
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7 times octagonal numbers: 7*n*(3*n-2).
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0
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0, 7, 56, 147, 280, 455, 672, 931, 1232, 1575, 1960, 2387, 2856, 3367, 3920, 4515, 5152, 5831, 6552, 7315, 8120, 8967, 9856, 10787, 11760, 12775, 13832, 14931, 16072, 17255, 18480, 19747, 21056, 22407, 23800, 25235, 26712, 28231
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = 21*n^2 - 14*n = A000567(n)*7.
a(n) = a(n-1)+42*n-35 (with a(0)=0). [From Vincenzo Librandi, Nov 27 2010]
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MATHEMATICA
| s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 7, 8!, 42}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 03 2009]
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PROG
| (MAGMA) [ 7*n*(3*n-2): n in [0..40] ];
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CROSSREFS
| Cf. A000567 (octagonal numbers), A153796, A153808.
Sequence in context: A097254 A043911 A044526 * A090224 A047664 A055345
Adjacent sequences: A153794 A153795 A153796 * A153798 A153799 A153800
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Jan 20 2009
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