The following is a solved problem:

So, I don't understand how they got the 37 from...

We assign numbers to each symbols using the rules here. We get:

$\displaystyle 13(7+8)(13+8.2^3.3^1)(7+8)(7+8)(7+8)$

So when we place these as exponents of odd prime numbers we get:

$\displaystyle 2^{13} \times 3^{15} \times 5^{205} \times 7^{15} \times 11^{15} \times 13^{15}$

The third term evaluates to 205, so why did they use 37?