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Pi to 30 digits.
Pi to about 150 digits. Fun fact, if you knew the exact diameter of a circle the size of the known universe, and wanted to calculate the circumference to within the width of an atom, you'd only need about 40 digits. More than that is pure overkill for any practical application.
I memorized up to the first zero and figured that would be fine for any interstellar cartography that I might get up to.
Not so useless considering digits of pi make for the best passwords.
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