a(n) = smallest number m such that UnitarySigma(m) = n*m/(n-1).

Terms

a(0) =6a(1) =2a(2) =3a(3) =4a(4) =5a(5) =216a(6) =7a(7) =8a(8) =9a(9) =5292000a(10) =11a(11) =10584000a(12) =13a(14) =165375a(15) =16a(16) =17a(17) =235270656a(18) =19a(22) =23a(24) =25