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Search: id:A153797
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| A153797 |
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7 times octagonal numbers: 7n(3n-2). |
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+0
1
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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; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = 21n^2 - 14n = A000567(n)*7.
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MATHEMATICA
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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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CROSSREFS
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Cf. A000567, A153796, A153808.
Sequence in context: A097254 A043911 A044526 this_sequence A090224 A047664 A055345
Adjacent sequences: A153794 A153795 A153796 this_sequence A153798 A153799 A153800
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jan 20 2009
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