Numbers k such that 3^k - phi(k) is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =6a(4) =20a(5) =22a(6) =25a(7) =46a(8) =47a(9) =214a(10) =822a(11) =985a(12) =3273a(13) =3590a(14) =4658a(15) =4768a(16) =17250a(17) =38697