Triangular numbers T such that T+2 is a prime.

Terms

a(0) =1a(1) =3a(2) =15a(3) =21a(4) =45a(5) =105a(6) =171a(7) =231a(8) =351a(9) =465a(10) =561a(11) =741a(12) =861a(13) =1275a(14) =1431a(15) =1485a(16) =2211a(17) =2415a(18) =2775a(19) =3081a(20) =3321a(21) =4005a(22) =4371a(23) =5151a(24) =7875a(25) =8385a(26) =10731a(27) =11175a(28) =11781a(29) =13041