Numbers k such that sum(d|k, sigma(d)^2/d) is an integer, where d are the divisors of k.

Terms

a(0) =1a(1) =205a(2) =3895a(3) =8525a(4) =17050a(5) =71951a(6) =74005a(7) =148010a(8) =359755a(9) =451825a(10) =903650a(11) =1628110a(12) =1632005a(13) =1798775a(14) =2346674a(15) =3597550a(16) =4218285a(17) =8436570a(18) =8993875a(19) =14749955a(20) =17987750a(21) =50471410a(22) =59071771a(23) =92802270a(24) =95335075a(25) =190670150a(26) =280249145a(27) =295358855a(28) =451356495a(29) =481068170