Difference between Two Squares equal to Repunit/Examples/R 6

Example of Difference between Two Squares equal to Repunit
We have that:


 * $111 \, 111 = 3 \times 7 \times 11 \times 13 \times 37$

So, from Tau Function of $111 \, 111$, there are $32$ divisors of $111 \, 111$, which can be grouped in $16$ pairs, each of which will generate a Difference between Two Squares equal to $111 \, 111$.

Hence: