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Search: id:A153448
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| A153448 |
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3 times 12-gonal numbers: 3n(5n-4). |
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+0
1
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| 0, 3, 36, 99, 192, 315, 468, 651, 864, 1107, 1380, 1683, 2016, 2379, 2772, 3195, 3648, 4131, 4644, 5187, 5760, 6363, 6996, 7659, 8352, 9075, 9828, 10611, 11424, 12267, 13140, 14043, 14976, 15939, 16932, 17955, 19008, 20091, 21204
(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) = 15n^2 - 12n = A051624(n)*3.
a(n)=30*n+a(n-1)-57 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 15 2009]
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EXAMPLE
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For n=2, a(2)=30*2+0-57=3; n=3, a(3)=30*3+3-57=36; n=4, a(4)=30*4+36-57=99 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 15 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 3, 7!, 30}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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Cf. A051624, A152965.
Sequence in context: A113799 A072682 A158207 this_sequence A140958 A156189 A158077
Adjacent sequences: A153445 A153446 A153447 this_sequence A153449 A153450 A153451
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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), Dec 26 2008
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