Numbers m such that psi(x) = phi(m) has a solution while sigma(y) = phi(m) has none.

Terms

a(0) =751a(1) =919a(2) =1502a(3) =1838a(4) =2841a(5) =3788a(6) =5682a(7) =6629a(8) =8523a(9) =11251a(10) =11937a(11) =13258a(12) =13669a(13) =14205a(14) =15137a(15) =15152a(16) =15397a(17) =15607a(18) =15916a(19) =16099a(20) =17046a(21) =18940a(22) =19895a(23) =22502a(24) =22728a(25) =23874a(26) =27338a(27) =28410a(28) =30103a(29) =30274