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Search: id:A139591
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| 0, 1, 9, 18, 34, 51, 75, 100, 132, 165, 205, 246, 294, 343, 399, 456, 520, 585, 657, 730, 810, 891, 979, 1068, 1164, 1261, 1365, 1470, 1582, 1695, 1815, 1936, 2064, 2193, 2329, 2466, 2610, 2755, 2907, 3060, 3220, 3381, 3549, 3718, 3894
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Sequence found by reading the line from 0, in the direction 0, 9,... and the line from 1, in the direction 1, 18,..., 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+n, 8*(n+1)^2 - 7(n+1).
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EXAMPLE
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Array begins:
0, 1
9, 18
34, 51
75, 100
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CROSSREFS
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Cf. A000217, A046092, A051870, A139275, A077221, A139592, A139593, A139595, A139596, A139597, A139598.
Sequence in context: A044433 A161570 A140089 this_sequence A109668 A051063 A162689
Adjacent sequences: A139588 A139589 A139590 this_sequence A139592 A139593 A139594
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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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