Numbers n such that sigma(n) * antisigma(n) is a perfect square, where antisigma(n) = sum of the non-divisors of n that are between 1 and n.
A076646
Numbers n such that sigma(n) * antisigma(n) is a perfect square, where antisigma(n) = sum of the non-divisors of n that are between 1 and n.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =20a(4) =24a(5) =28a(6) =104a(7) =224a(8) =5065a(9) =766192670
External references
- oeis: A076646