Numbers k such that iterations of phi(k), phi(phi(k)), ... end in ... 6, 2, 1.

Terms

a(0) =6a(1) =7a(2) =9a(3) =14a(4) =18a(5) =19a(6) =27a(7) =38a(8) =54a(9) =81a(10) =162a(11) =163a(12) =243a(13) =326a(14) =486a(15) =487a(16) =729a(17) =974a(18) =1458a(19) =1459a(20) =2187a(21) =2918a(22) =4374a(23) =6561a(24) =13122a(25) =19683a(26) =39366a(27) =39367a(28) =59049a(29) =78734