Numbers k such that phi(k+2) = phi(k) + 2.

Terms

a(0) =3a(1) =5a(2) =6a(3) =11a(4) =12a(5) =14a(6) =17a(7) =18a(8) =20a(9) =29a(10) =41a(11) =44a(12) =59a(13) =62a(14) =71a(15) =92a(16) =101a(17) =107a(18) =116a(19) =137a(20) =149a(21) =164a(22) =179a(23) =191a(24) =197a(25) =212a(26) =227a(27) =239a(28) =254a(29) =269