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nowadays students will just google it and see that is unsolved

It's still hard if you don't know/recognize the name of a problem and mathematical form is usually easy to disguise.

This is what https://oeis.org/ is for.

Can you Google an equation?

You can to a degree. I've done it a bunch for my math classes. :)

EDIT: Also wolfram alpha

So how does it look? Lots of parentheses? Are the special characters replaced with something?

Write it in TeX, then search for that.