Triangular numbers > 0 with a prime signature that has not occurred earlier.

Terms

a(0) =1a(1) =3a(2) =6a(3) =28a(4) =36a(5) =66a(6) =120a(7) =136a(8) =210a(9) =276a(10) =300a(11) =496a(12) =528a(13) =630a(14) =1176a(15) =2016a(16) =2080a(17) =3240a(18) =3570a(19) =4560a(20) =4950a(21) =5460a(22) =6216a(23) =8128a(24) =8256a(25) =9180a(26) =25200a(27) =29403a(28) =32640a(29) =32896