Pi is well known, up to many more than hundred digits. People memorize it, or look it up, but they don't need to calculate again (unless they want to go to extremes).
We pronounce d and t exactly the same way, so both sound like d to other people, but ofc we know from context which one is meant, always, therefore to us they aren't the same at all! :)
You want to hire the "guru", not the "principal". You want to actually ask him to write 0xD6 in decimal, and if he dares to answer "Seriously? Come on now, that's boring", then you hire him on the spot.
But you can't hire only gurus. You need normal seniors, too. Build a normal team around one guru. Maybe build one ultra advanced team around 2-3 gurus, if you really need to invent new and hardcore difficult stuff.
They don't.
Pi is well known, up to many more than hundred digits. People memorize it, or look it up, but they don't need to calculate again (unless they want to go to extremes).