Numbers k such that nusigma(usigma(k)) = 2k, where usigma(k) is the sum of unitary divisors of k (A034448) and nusigma(k) is the sum of non-unitary divisors of k (A048146).

A063891

Numbers k such that nusigma(usigma(k)) = 2k, where usigma(k) is the sum of unitary divisors of k (A034448) and nusigma(k) is the sum of non-unitary divisors of k (A048146).

Terms

    a(0) =1631a(1) =2016a(2) =8928a(3) =11808a(4) =36576a(5) =45360a(6) =1486080a(7) =2359008a(8) =3093552a(9) =37748448a(10) =101350656a(11) =150994656a(12) =2885670144

External references