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A109048
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a(n) = lcm(n, 7).
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3
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0, 7, 14, 21, 28, 35, 42, 7, 56, 63, 70, 77, 84, 91, 14, 105, 112, 119, 126, 133, 140, 21, 154, 161, 168, 175, 182, 189, 28, 203, 210, 217, 224, 231, 238, 35, 252, 259, 266, 273, 280, 287, 42, 301, 308, 315, 322, 329, 336, 49, 350, 357, 364, 371, 378, 385, 56
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OFFSET
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0,2
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,2,0,0,0,0,0,0,-1).
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FORMULA
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a(n) = n*7/gcd(n, 7).
Sum_{k=1..n} a(k) ~ (43/14) * n^2. - Amiram Eldar, Nov 26 2022
Sum_{n>=1} (-1)^(n+1)/a(n) = 13*log(2)/49. - Amiram Eldar, Sep 08 2023
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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