Given an integer $$$N$$$, how many of its divisors are also divisors of $$$N - 1$$$?
For Chinese readers, Chinese statement is here:
你刚刚对我说了什么，那只小母狗 $$$N$$$ 我会让你知道我从海军海豹突击队毕业了 $$$N - 1$$$?
Someone says it's related to the theoretical proof of the $$$abc$$$ conjecture, but I simply cannot understand why...
Your chinese statement is crap. Are you trolling or what?