Numbers whose absolute difference from a triangular number is never a prime.

Terms

a(0) =351a(1) =561a(2) =780a(3) =990a(4) =1176a(5) =1596a(6) =2016a(7) =2145a(8) =3321a(9) =3741a(10) =4278a(11) =4371a(12) =5565a(13) =6216a(14) =6786a(15) =7503a(16) =7626a(17) =7875a(18) =8256a(19) =10296a(20) =10440a(21) =10731a(22) =11781a(23) =12561a(24) =12880a(25) =13041a(26) =13695a(27) =14196a(28) =14535a(29) =14706