You are wrong. Factoring large numbers has never been considered the pinnacle of true intelligence. Find me a reference if you expect me to believe that circa 1859 something so simple was considered as the pinnacle of anything.
I completely agree about the moving goalposts critique, and I think there is good AI and has been great progress, but when you find yourself defending the idea that a program that factors numbers is a good example of artificial intelligence, alarm bells should start ringing, regardless of whether you are talking about intelligence or optimization.
I think that this is perhaps a bad example, because even today if you ask someone on the street to find the factors of 9,991 there's no way they'll do it, and if you show them someone who can do they will say "wow that's really clever, she must be intelligent".
So it is still the case that factoring 9991 would be considered by most people to require lots of intelligence. Hell, most people couldn't factorize 100, never mind 9,991 or 453,443.
People are stupider than you think.
Here's our place to discuss Less Wrong topics that have not appeared in recent posts. Have fun building smaller brains inside of your brains (or not, as you please).