Integers m such that sigma(m)^2 is divisible by m.

Terms

a(0) =1a(1) =6a(2) =24a(3) =28a(4) =120a(5) =224a(6) =234a(7) =270a(8) =496a(9) =588a(10) =600a(11) =672a(12) =864a(13) =1080a(14) =1521a(15) =1638a(16) =1782a(17) =2016a(18) =3724a(19) =4320a(20) =4680a(21) =5733a(22) =6048a(23) =6200a(24) =6552a(25) =7128a(26) =8128a(27) =11172a(28) =11466a(29) =15872