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Search: id:A152767
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| A152767 |
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3 times 10-gonal numbers: 3n(4n-3). |
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+0
1
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| 0, 3, 30, 81, 156, 255, 378, 525, 696, 891, 1110, 1353, 1620, 1911, 2226, 2565, 2928, 3315, 3726, 4161, 4620, 5103, 5610, 6141, 6696, 7275, 7878, 8505, 9156, 9831, 10530, 11253, 12000, 12771, 13566, 14385, 15228, 16095, 16986
(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) = 12n^2 - 9n = A001107(n)*3.
a(n)=24*n+a(n-1)-45 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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EXAMPLE
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For n=2, a(2)=24*2+0-45=3; n=3, a(3)=24*3+3-45=30; n=4, a(4)=24*4+30-45=81 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 3, 6!, 24}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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Cf. A001107, A139271.
Sequence in context: A132084 A012009 A001800 this_sequence A035328 A100259 A031205
Adjacent sequences: A152764 A152765 A152766 this_sequence A152768 A152769 A152770
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KEYWORD
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easy,nonn,new
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 15 2008
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