Numbers k such that k-th and (k+1)st primes differ by 4.

Terms

a(0) =4a(1) =6a(2) =8a(3) =12a(4) =14a(5) =19a(6) =22a(7) =25a(8) =27a(9) =29a(10) =31a(11) =38a(12) =44a(13) =48a(14) =50a(15) =59a(16) =63a(17) =65a(18) =70a(19) =75a(20) =78a(21) =85a(22) =88a(23) =90a(24) =93a(25) =95a(26) =112a(27) =117a(28) =122a(29) =131