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A143839
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Ulam's spiral (SSE spoke).
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1
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1, 24, 79, 166, 285, 436, 619, 834, 1081, 1360, 1671, 2014, 2389, 2796, 3235, 3706, 4209, 4744, 5311, 5910, 6541, 7204, 7899, 8626, 9385, 10176, 10999, 11854, 12741, 13660, 14611, 15594, 16609, 17656, 18735, 19846, 20989, 22164, 23371, 24610
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) = 16n^2-25n+10, n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008]
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MATHEMATICA
| f[n_] := 16n^2 -25n +10; Array[f, 40] (* Vladimir Orlovsky, Sep 02 2008 *)
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CROSSREFS
| Sequence in context: A206010 A124140 A206003 * A114818 A068379 A190102
Adjacent sequences: A143836 A143837 A143838 * A143840 A143841 A143842
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 02 2008
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