803
I bet the rest of the world has better paper
(sh.itjust.works)
I use Arch btw
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Relation 1 to SQR 2, from A0 of 1m2 to A5 letter format (A4, A5 most used in the EU), every time the half of the next bigger format. Easy to remember.
https://www.papersizes.org/a-paper-sizes.htm