Least triangular n-gonal number greater than 1, or 0 if none exists.

Terms

a(0) =3a(1) =36a(2) =210a(3) =6a(4) =55a(5) =21a(6) =325a(7) =10a(8) =0a(9) =105a(10) =36a(11) =1275a(12) =15a(13) =45a(14) =231a(15) =0a(16) =946a(17) =276a(18) =21a(19) =11935a(20) =66a(21) =136a(22) =351a(23) =1596a(24) =78a(25) =28a(26) =1225a(27) =595a(28) =820a(29) =58653