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

Terms

a(0) =160a(1) =168a(2) =352a(3) =448a(4) =816a(5) =928a(6) =972a(7) =1024a(8) =1176a(9) =1848a(10) =2464a(11) =3040a(12) =3808a(13) =4152a(14) =4440a(15) =4512a(16) =4736a(17) =4944a(18) =5104a(19) =5152a(20) =5160a(21) =5304a(22) =5952a(23) =6408a(24) =6656a(25) =6672a(26) =6784a(27) =7648a(28) =8384a(29) =8704