Numbers k such that prime(k) + k and prime(k) - k are both primes.

Terms

a(0) =4a(1) =6a(2) =18a(3) =42a(4) =66a(5) =144a(6) =282a(7) =384a(8) =408a(9) =450a(10) =522a(11) =564a(12) =618a(13) =672a(14) =720a(15) =732a(16) =744a(17) =828a(18) =858a(19) =1122a(20) =1308a(21) =1374a(22) =1560a(23) =1644a(24) =1698a(25) =1776a(26) =1848a(27) =1920a(28) =2022a(29) =2304