Numbers k such that the sum of unitary divisors of k^2 is a square.

Terms

a(0) =1a(1) =42a(2) =120a(3) =156a(4) =246a(5) =287a(6) =1434a(7) =1673a(8) =2016a(9) =5256a(10) =9799a(11) =11808a(12) =18330a(13) =19740a(14) =21385a(15) =34440a(16) =39990a(17) =44772a(18) =45990a(19) =46655a(20) =57270a(21) =60156a(22) =66815a(23) =68832a(24) =102648a(25) =115620a(26) =125255a(27) =149472a(28) =156570a(29) =170820