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Search: id:A143838
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| A143838 |
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Ulam/Prime spiral (SSW). |
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+0
1
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| 1, 22, 75, 160, 277, 426, 607, 820, 1065, 1342, 1651, 1992, 2365, 2770, 3207, 3676, 4177, 4710, 5275, 5872, 6501, 7162, 7855, 8580, 9337, 10126, 10947, 11800, 12685, 13602, 14551, 15532, 16545, 17590, 18667, 19776, 20917, 22090, 23295, 24532
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)= 16n^2-27n+12, n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008]
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MATHEMATICA
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lst={1}; a=3; Do[AppendTo[lst, n*n-a]; a=a+3, {n, 5, 6!, 4}]; lst
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CROSSREFS
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Adjacent sequences: A143835 A143836 A143837 this_sequence A143839 A143840 A143841
Sequence in context: A044160 A044541 A080861 this_sequence A003908 A075252 A094844
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 02 2008
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