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Search: id:A139597
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| 0, 7, 15, 30, 46, 69, 93, 124, 156, 195, 235, 282, 330, 385, 441, 504, 568, 639, 711, 790, 870, 957, 1045, 1140, 1236, 1339, 1443, 1554, 1666, 1785, 1905, 2032, 2160, 2295, 2431, 2574, 2718, 2869, 3021, 3180, 3340, 3507, 3675, 3850
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Sequence found by reading the line from 0, in the direction 0, 7,... and the line from 15, in the direction 15, 46,..., in the square spiral whose vertices are the triangular numbers A000217.
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LINKS
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O. E. Pol, Determinacion geometrica de los numeros primos y perfectos.
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FORMULA
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Array read by rows: row n gives 8*n^2 + 7n, 8*(n+1)^2 - (n+1).
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EXAMPLE
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Array begins:
0, 7
15, 30
46, 69
93, 124
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CROSSREFS
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Cf. A000217, A046092, A139274, A139278, A077221, A139591, A139592, A139593, A139595, A139596, A139598.
Sequence in context: A063611 A146624 A006188 this_sequence A117747 A137196 A120094
Adjacent sequences: A139594 A139595 A139596 this_sequence A139598 A139599 A139600
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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), May 03 2008
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