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Search: id:A140689
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| 0, 23, 52, 87, 128, 175, 228, 287, 352, 423, 500, 583, 672, 767, 868, 975, 1088, 1207, 1332, 1463, 1600, 1743, 1892, 2047, 2208, 2375, 2548, 2727, 2912, 3103, 3300, 3503, 3712, 3927, 4148, 4375, 4608, 4847, 5092, 5343, 5600, 5863
(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)=3*n^2 + 20*n.
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MATHEMATICA
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a[n_]:=Sum[6*i+17, {i, 1, n}]; [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 04 2008]
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CROSSREFS
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Cf. A033428, A045944, A140676, A067725, A140677, A140678, A067707, A140679, A140680, A140681.
Sequence in context: A157095 A135771 A067625 this_sequence A113912 A055782 A104802
Adjacent sequences: A140686 A140687 A140688 this_sequence A140690 A140691 A140692
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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), May 22 2008
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