a(n) = prime(n+6) - prime(n).

Terms

a(0) =15a(1) =16a(2) =18a(3) =22a(4) =20a(5) =24a(6) =24a(7) =24a(8) =24a(9) =24a(10) =28a(11) =24a(12) =26a(13) =28a(14) =26a(15) =26a(16) =24a(17) =28a(18) =30a(19) =30a(20) =30a(21) =28a(22) =26a(23) =24a(24) =30a(25) =30a(26) =34a(27) =32a(28) =40a(29) =38