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0, 5, 13, 26, 42, 63, 87, 116, 148, 185, 225, 270, 318, 371, 427, 488, 552, 621, 693, 770, 850, 935, 1023, 1116, 1212, 1313, 1417, 1526, 1638, 1755, 1875, 2000, 2128, 2261, 2397, 2538, 2682, 2831, 2983, 3140, 3300, 3465, 3633, 3806
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sequence found by reading the line from 0, in the direction 0, 5,... and the same line from 0, in the direction 0, 13,..., in the square spiral whose vertices are the triangular numbers A000217.
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LINKS
| O. E. Pol, Determinacion geometrica de los numeros primos y perfectos.
Index to sequences with linear recurrences with constant coefficients, signature (2,0,-2,1)
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FORMULA
| Array read by rows: row n gives 8*n^2 + 5n, 8*(n+1)^2 - 3(n+1).
G.f. -x*(5+3*x) / ( (1+x)*(x-1)^3 ). - R. J. Mathar, Feb 13 2011
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EXAMPLE
| Array begins:
0, 5
13, 26
42, 63
87, 116
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CROSSREFS
| Cf. A000217, A046092, A139273, A139277, A077221, A139591, A139592, A139593, A139596, A139597, A139598.
Sequence in context: A173979 A190446 A188471 * A008778 A014813 A180671
Adjacent sequences: A139592 A139593 A139594 * A139596 A139597 A139598
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 03 2008
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