Hexagonal numbers with prime indices.

Terms

a(0) =6a(1) =15a(2) =45a(3) =91a(4) =231a(5) =325a(6) =561a(7) =703a(8) =1035a(9) =1653a(10) =1891a(11) =2701a(12) =3321a(13) =3655a(14) =4371a(15) =5565a(16) =6903a(17) =7381a(18) =8911a(19) =10011a(20) =10585a(21) =12403a(22) =13695a(23) =15753a(24) =18721a(25) =20301a(26) =21115a(27) =22791a(28) =23653a(29) =25425