a(n) = prime(2*n*(n+1)+1).

Terms

a(0) =2a(1) =11a(2) =41a(3) =97a(4) =179a(5) =283a(6) =439a(7) =617a(8) =829a(9) =1087a(10) =1381a(11) =1697a(12) =2081a(13) =2467a(14) =2909a(15) =3433a(16) =3929a(17) =4517a(18) =5119a(19) =5801a(20) =6481a(21) =7237a(22) =8059a(23) =8863a(24) =9739a(25) =10663a(26) =11701a(27) =12659a(28) =13729a(29) =14867