Centered triangular numbers that are prime.

Terms

a(0) =19a(1) =31a(2) =109a(3) =199a(4) =409a(5) =571a(6) =631a(7) =829a(8) =1489a(9) =1999a(10) =2341a(11) =2971a(12) =3529a(13) =4621a(14) =4789a(15) =7039a(16) =7669a(17) =8779a(18) =9721a(19) =10459a(20) =10711a(21) =13681a(22) =14851a(23) =16069a(24) =16381a(25) =17659a(26) =20011a(27) =20359a(28) =23251a(29) =25939