Primes of the form k(k+1)/2-2 (i.e., two less than triangular numbers).

Terms

a(0) =13a(1) =19a(2) =43a(3) =53a(4) =89a(5) =103a(6) =151a(7) =229a(8) =251a(9) =349a(10) =433a(11) =463a(12) =593a(13) =701a(14) =739a(15) =859a(16) =1033a(17) =1223a(18) =1429a(19) =1483a(20) =1709a(21) =1889a(22) =1951a(23) =2143a(24) =2699a(25) =3001a(26) =3079a(27) =3319a(28) =3739a(29) =4003