9:09 AM
@Vepir
2

Definition Let $W$ be the function , defined as $W(a,b)=r$ given $a,b\in \mathbb{Z_+}$ and $a>1$ Take $m$ to be the integer s.t. $a^{m+1} \ge b > a^{m}$, i.e. $m = \lceil \log{b}/\log{a} \rceil - 1$. Convert number $a^{m+1} - b$ in base $a$ and add it...

9:37 AM
Looks interesting, don't have time to look into it today thought.

2 hours later…
11:16 AM
@Vepir reached $5\cdot 10^{11}$ ?

1 hour later…
12:24 PM
@Peter Yes, no factors found.