Noncototients: numbers k such that x - phi(x) = k has no solution.

Terms

a(0) =10a(1) =26a(2) =34a(3) =50a(4) =52a(5) =58a(6) =86a(7) =100a(8) =116a(9) =122a(10) =130a(11) =134a(12) =146a(13) =154a(14) =170a(15) =172a(16) =186a(17) =202a(18) =206a(19) =218a(20) =222a(21) =232a(22) =244a(23) =260a(24) =266a(25) =268a(26) =274a(27) =290a(28) =292a(29) =298