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A062835
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Sum of divisors of n^2-1; or sigma(A005563(n)).
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1
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0, 4, 15, 24, 60, 48, 124, 104, 186, 156, 360, 168, 480, 336, 504, 432, 819, 360, 1170, 640, 1080, 768, 1488, 744, 1736, 1240, 1680, 1200, 2880, 960, 3048, 1536, 2286, 2304, 3510, 1824, 3900, 2128, 3720, 2352, 5952, 1848, 5760, 3432, 4320, 3744, 6048
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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MATHEMATICA
| Table[DivisorSigma[1, n^2 - 1], {n, 2, 50}]
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PROG
| (PARI) j=[]; for(n=2, 120, j=concat(j, sigma(n^2-1))); j
(PARI) { for (n=1, 1000, if (n>1, a=sigma(n^2 - 1), a=0); write("b062835.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 12 2009]
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CROSSREFS
| Cf. A005563.
Sequence in context: A192201 A054308 A051531 * A203231 A060052 A171788
Adjacent sequences: A062832 A062833 A062834 * A062836 A062837 A062838
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KEYWORD
| easy,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jul 21 2001
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