The side lengths of a

**Heronian Triangle** are R-1, R and R+1, where R is an 8-digit positive integer which does not contain any leading zero.

Determine all possible value(s) of R for which this is possible.

(In reply to

One possible value by Jim Keneipp)

I am fairly sure the recursion you gave generates all solutions. The equation R^2 - 4 = 3N^2 is a Pell-like equation. Those typically have only one family of solutions related by recursion. I usually find the recursion formula and leave it at that.