Triangular numbers which are a concatenation of two or more positive triangular numbers.

Terms

a(0) =36a(1) =66a(2) =136a(3) =153a(4) =378a(5) =666a(6) =1128a(7) =1378a(8) =1711a(9) =2145a(10) =3003a(11) =3321a(12) =3655a(13) =3741a(14) =3916a(15) =4656a(16) =6105a(17) =6216a(18) =6328a(19) =6786a(20) =6903a(21) =10153a(22) =11325a(23) =11628a(24) =11781a(25) =13366a(26) =13861a(27) =16110a(28) =19110a(29) =21115