a(n) is n-th prime == 1 (mod 6n).

Terms

a(0) =7a(1) =37a(2) =73a(3) =241a(4) =211a(5) =433a(6) =463a(7) =769a(8) =811a(9) =1321a(10) =1321a(11) =2089a(12) =1951a(13) =2689a(14) =2791a(15) =4513a(16) =3469a(17) =5077a(18) =6271a(19) =6121a(20) =6427a(21) =7129a(22) =7177a(23) =10369a(24) =7951a(25) =10453a(26) =10531a(27) =13441a(28) =15139a(29) =12601