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Search: id:A143860
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| A143860 |
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Ulam/prime spiral (NNW). |
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+0
1
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| 1, 16, 63, 142, 253, 396, 571, 778, 1017, 1288, 1591, 1926, 2293, 2692, 3123, 3586, 4081, 4608, 5167, 5758, 6381, 7036, 7723, 8442, 9193, 9976, 10791, 11638, 12517, 13428, 14371, 15346, 16353, 17392, 18463, 19566, 20701, 21868, 23067, 24298
(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^2-33n+18. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 08 2008]
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MATHEMATICA
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lst={1}; a=0; Do[AppendTo[lst, n*n-a]; a++, {n, 4, 6!, 4}]; lst
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CROSSREFS
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Sequence in context: A118254 A066391 A022289 this_sequence A100176 A060091 A076751
Adjacent sequences: A143857 A143858 A143859 this_sequence A143861 A143862 A143863
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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 03 2008
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