Numbers k such that sum(d|k, sigma(d)^2) is a multiple of k.

Terms

a(0) =1a(1) =2a(2) =10a(3) =185a(4) =370a(5) =3145a(6) =6290a(7) =40885a(8) =53465a(9) =63750a(10) =81770a(11) =106930a(12) =241400a(13) =348750a(14) =427720a(15) =828750a(16) =866200a(17) =1207000a(18) =1306875a(19) =1635449a(20) =2613750a(21) =3138200a(22) =3270898a(23) =7149375a(24) =8054345a(25) =8177245a(26) =14298750a(27) =14725400a(28) =15691000a(29) =16108690