a(n) = prime(n+7) - prime(n).

Terms

a(0) =17a(1) =20a(2) =24a(3) =24a(4) =26a(5) =28a(6) =26a(7) =28a(8) =30a(9) =30a(10) =30a(11) =30a(12) =30a(13) =30a(14) =32a(15) =30a(16) =30a(17) =36a(18) =34a(19) =32a(20) =34a(21) =30a(22) =30a(23) =38a(24) =34a(25) =36a(26) =36a(27) =42a(28) =42a(29) =44