Numbers k such that phi(k) + phi(k+1) = k+2.

Terms

a(0) =4a(1) =6a(2) =8a(3) =50a(4) =74a(5) =110a(6) =170a(7) =174a(8) =890a(9) =902a(10) =1310a(11) =1434a(12) =1826a(13) =2714a(14) =4190a(15) =5030a(16) =6494a(17) =8234a(18) =8474a(19) =10142a(20) =14390a(21) =31670a(22) =32394a(23) =40514a(24) =89990a(25) =95174a(26) =101834a(27) =102554a(28) =135374a(29) =151754