Primes of form p = 2 + Sum_{k = 1..m} k^2 for some m.

Terms

a(0) =3a(1) =7a(2) =821a(3) =1787a(4) =2111a(5) =3313a(6) =3797a(7) =5527a(8) =6203a(9) =13687a(10) =31397a(11) =40427a(12) =63367a(13) =116797a(14) =137827a(15) =208337a(16) =238967a(17) =247067a(18) =281297a(19) =348553a(20) =723907a(21) =811037a(22) =1048063a(23) =1511017a(24) =1538573a(25) =1771177a(26) =2268317a(27) =3064987a(28) =4298387a(29) =4694923