a(n) = prime(6*n - 1).

Terms

a(0) =11a(1) =31a(2) =59a(3) =83a(4) =109a(5) =149a(6) =179a(7) =211a(8) =241a(9) =277a(10) =313a(11) =353a(12) =389a(13) =431a(14) =461a(15) =499a(16) =547a(17) =587a(18) =617a(19) =653a(20) =691a(21) =739a(22) =773a(23) =823a(24) =859a(25) =907a(26) =947a(27) =991a(28) =1031a(29) =1063