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Search: id:A139596
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| 0, 6, 14, 28, 44, 66, 90, 120, 152, 190, 230, 276, 324, 378, 434, 496, 560, 630, 702, 780, 860, 946, 1034, 1128, 1224, 1326, 1430, 1540, 1652, 1770, 1890, 2016, 2144, 2278, 2414, 2556, 2700, 2850, 3002, 3160, 3320, 3486, 3654, 3828
(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, 6,... and the same line from 0, in the direction 0, 14,..., 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 + 6n, 8*(n+1)^2 - 2(n+1).
O.g.f.: -2x(x+3)/((x-1)^3*(1+x)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 06 2008
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EXAMPLE
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Array begins:
0, 6
14, 28
44, 66
90, 120
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CROSSREFS
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Cf. A000217, A014635, A033587, A046092, A077221, A139591, A139592, A139593, A139595, A139597, A139598.
Sequence in context: A071776 A063590 A128806 this_sequence A143702 A134067 A024932
Adjacent sequences: A139593 A139594 A139595 this_sequence A139597 A139598 A139599
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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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