a(n) = prime(7*n-3).

Terms

a(0) =7a(1) =31a(2) =61a(3) =97a(4) =131a(5) =167a(6) =199a(7) =241a(8) =281a(9) =331a(10) =373a(11) =419a(12) =457a(13) =499a(14) =557a(15) =599a(16) =641a(17) =677a(18) =733a(19) =773a(20) =827a(21) =877a(22) =929a(23) =977a(24) =1021a(25) =1063a(26) =1109a(27) =1171a(28) =1223a(29) =1279