Numbers k such that sigma (x) = k has exactly 12 solutions.

Terms

a(0) =1512a(1) =1872a(2) =2352a(3) =3192a(4) =3780a(5) =4104a(6) =4560a(7) =4752a(8) =5880a(9) =6120a(10) =8160a(11) =8424a(12) =8820a(13) =11424a(14) =13056a(15) =15264a(16) =16464a(17) =16704a(18) =17160a(19) =17360a(20) =17760a(21) =18648a(22) =19680a(23) =19800a(24) =20880a(25) =22752a(26) =23616a(27) =24552a(28) =24864a(29) =27432