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A132760
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a(n) = n*(n+15).
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17
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0, 16, 34, 54, 76, 100, 126, 154, 184, 216, 250, 286, 324, 364, 406, 450, 496, 544, 594, 646, 700, 756, 814, 874, 936, 1000, 1066, 1134, 1204, 1276, 1350, 1426, 1504, 1584, 1666, 1750, 1836, 1924, 2014, 2106, 2200, 2296, 2394, 2494
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = n*(n + 15).
Sum_{n>=1} 1/a(n) = 1195757/5405400 = 0.22121526621... - R. J. Mathar, Jul 14 2012
Sum_{n>=1} (-1)^(n+1)/a(n) = 2*log(2)/15 - 52279/1081080. - Amiram Eldar, Jan 15 2021
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MATHEMATICA
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Table[n(n+15), {n, 0, 60}] (* or *) LinearRecurrence[{3, -3, 1}, {0, 16, 34}, 60] (* Harvey P. Dale, Jan 20 2019 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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