Difference between n-th prime and (n+2)-nd prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =6a(4) =6a(5) =6a(6) =6a(7) =10a(8) =8a(9) =8a(10) =10a(11) =6a(12) =6a(13) =10a(14) =12a(15) =8a(16) =8a(17) =10a(18) =6a(19) =8a(20) =10a(21) =10a(22) =14a(23) =12a(24) =6a(25) =6a(26) =6a(27) =6a(28) =18a(29) =18