Numbers n such that there is no triangular n-gonal number greater than 1.

Terms

a(0) =11a(1) =18a(2) =38a(3) =102a(4) =198a(5) =326a(6) =486a(7) =678a(8) =902a(9) =1158a(10) =1446a(11) =1766a(12) =2118a(13) =2918a(14) =3366a(15) =3846a(16) =4358a(17) =4902a(18) =5478a(19) =6086a(20) =6726a(21) =7398a(22) =8102a(23) =8838a(24) =9606a(25) =10406a(26) =11238a(27) =12102a(28) =12998a(29) =13926