a(n) = prime(5n-1).

Terms

a(0) =7a(1) =23a(2) =43a(3) =67a(4) =89a(5) =109a(6) =139a(7) =167a(8) =193a(9) =227a(10) =251a(11) =277a(12) =311a(13) =347a(14) =373a(15) =401a(16) =433a(17) =461a(18) =491a(19) =523a(20) =569a(21) =599a(22) =619a(23) =653a(24) =683a(25) =727a(26) =757a(27) =797a(28) =827a(29) =859