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A366710
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Sum of the divisors of 12^n-1.
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13
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12, 168, 1896, 30240, 271464, 4247040, 39156480, 636854400, 5817876000, 72749094432, 852203639280, 15743437516800, 116720110574544, 1518251476008960, 17220536137159296, 292933954031846400, 2420303924088730368, 38936041113123840000, 348523635677043192936
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(3)=1896 because 12^3-1 has divisors {1, 11, 157, 1727}.
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MAPLE
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a:=n->numtheory[sigma](12^n-1):
seq(a(n), n=1..100);
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MATHEMATICA
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DivisorSigma[1, 12^Range[30]-1]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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