Smallest triangular number beginning with the n-th triangular number other than itself.

Terms

a(0) =10a(1) =36a(2) =66a(3) =105a(4) =153a(5) =210a(6) =2850a(7) =3655a(8) =4560a(9) =5565a(10) =666a(11) =780a(12) =9180a(13) =10585a(14) =12090a(15) =13695a(16) =153181a(17) =1711a(18) =190036a(19) =210276a(20) =231540a(21) =253116a(22) =276396a(23) =3003a(24) =325221a(25) =351541a(26) =378015a(27) =406351a(28) =435711a(29) =4656