Prime numbers indexed by oblong numbers.

Terms

a(0) =3a(1) =13a(2) =37a(3) =71a(4) =113a(5) =181a(6) =263a(7) =359a(8) =463a(9) =601a(10) =743a(11) =911a(12) =1091a(13) =1291a(14) =1511a(15) =1747a(16) =2017a(17) =2297a(18) =2617a(19) =2903a(20) =3271a(21) =3617a(22) =4003a(23) =4409a(24) =4831a(25) =5297a(26) =5743a(27) =6247a(28) =6761a(29) =7297