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Conditional DivisorSum

Posted 10 years ago

For n=60,

DivisorSum[60, # &, Mod[#, 5]==4 &]/DivisorSum[60, # &, Mod[#, 5]==1 &] = 4/(1+6) = 4/7

Is it possible to find a number (or all the numbers for instance less than 10^10), for which this ratio (the sum of those divisors which are congruent (-1) mod 5 divided by the sum of those divisors which are congruent (1) mod 5) would equal 1?

POSTED BY: kis miska
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