a(1) = 1; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).

A068618

a(1) = 1; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).

Terms

    a(0) =1a(1) =10a(2) =105a(3) =1035a(4) =103285a(5) =10832185a(6) =1083241785

External references