Numbers k such that phi(x) = k has exactly 6 solutions.

Terms

a(0) =12a(1) =16a(2) =84a(3) =88a(4) =112a(5) =232a(6) =348a(7) =408a(8) =592a(9) =736a(10) =760a(11) =780a(12) =832a(13) =952a(14) =984a(15) =1032a(16) =1048a(17) =1068a(18) =1128a(19) =1232a(20) =1272a(21) =1312a(22) =1332a(23) =1428a(24) =1432a(25) =1488a(26) =1552a(27) =1608a(28) =1692a(29) =1912