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Sep 25, 2020

if you repeatedly square the number 5 the last n digits eventually stabilize for every n and you get a number with infinitely many digits going to the left that squares to itself. it ends ...890625

QC (in Berlin 7/29-??? w/ COVID

)

@QiaochuYuan

Sep 25, 2020

now take 1 - (this number), which you can calculate by carrying infinitely many times or by writing 1 = ...999 (this is 100% legit). you get another number which ends ...109376 which also squares to itself, which you can also compute by repeatedly taking 16 to the 5th power