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A366617
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Sum of the divisors of 5^n+1.
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9
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3, 12, 42, 312, 942, 6264, 25284, 162000, 620460, 4961280, 16161768, 103442688, 367381884, 2441936064, 9859525284, 76963663296, 228970112844, 1526377433328, 6339280635408, 38199227335200, 144103649734968, 1285221510144000, 3894650946433800, 24349131482713344
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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a(3)=312 because 5^3+1 has divisors {1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126}.
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MAPLE
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a:=n->numtheory[sigma](5^n+1):
seq(a(n), n=0..100);
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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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