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A366684
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Sum of the divisors of 11^n-1.
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14
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18, 360, 2880, 46128, 299646, 7113600, 35893440, 686393568, 5105934720, 80436972240, 513593801496, 14266630210560, 62197735384584, 1165770116121600, 9349887314805120, 157025981601707904, 909804651298728804, 22898038082582016000, 110086362807146183340
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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)=2880 because 11^3-1 has divisors {1, 2, 5, 7, 10, 14, 19, 35, 38, 70, 95, 133, 190, 266, 665, 1330}.
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MAPLE
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a:=n->numtheory[sigma](11^n-1):
seq(a(n), n=1..100);
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MATHEMATICA
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DivisorSigma[1, 11^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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