a(1) = 5; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).
A068622
a(1) = 5; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).
Terms
- a(0) =5a(1) =15a(2) =105a(3) =1035a(4) =103285a(5) =10832185a(6) =1083241785
External references
- oeis: A068622