a(n) = prime(6*n-3).

Terms

a(0) =5a(1) =23a(2) =47a(3) =73a(4) =103a(5) =137a(6) =167a(7) =197a(8) =233a(9) =269a(10) =307a(11) =347a(12) =379a(13) =419a(14) =449a(15) =487a(16) =523a(17) =571a(18) =607a(19) =643a(20) =677a(21) =727a(22) =761a(23) =811a(24) =853a(25) =883a(26) =937a(27) =977a(28) =1019a(29) =1051