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MAA Found Math - Week 33

MAA FOUND MATH: Kiran S. Kedlaya took this photo in the Karlsplatz underground station in Vienna, Austria. He writes, "One can't tell this from a single photo, but the string of digits actually continues around a corner on to the next wall. At the end of the printed digits, there is an LCD display showing additional digits in batches of 10 (or so; I forget exactly)."

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