What is the secret operator?

Question

There is a secret operator $F$ that takes two whole numbers and outputs a new number. For example
$$begin{split}F(6,9) &= 15\
F(66,11) &= 110  \
F(86,18) &= 179end{split}$$
Can you find what $F$ does and what is the output of $F(601,81)$ ?
Hint:

Ewasted · Accepted Answer

The answer could be:

Therefore the output of $F(601, 81)$ would be

Ross Presser · Answer

For what it's worth, here's the solution as a short C# program. No string operations necessary :)

What is the secret operator?

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