Triangular numbers which are the average of two consecutive primes.

Terms

a(0) =6a(1) =15a(2) =21a(3) =45a(4) =105a(5) =120a(6) =231a(7) =300a(8) =351a(9) =465a(10) =741a(11) =780a(12) =861a(13) =1176a(14) =1431a(15) =1485a(16) =3081a(17) =3240a(18) =3321a(19) =3828a(20) =4005a(21) =4278a(22) =5460a(23) =6786a(24) =6903a(25) =7140a(26) =7381a(27) =7503a(28) =7875a(29) =8001