The Reason People Like 69 #shorts
Vsauce2
Aug 2, 2022 20:22
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Strobogrammatic numbers go beyond quantity to harness rotational symmetry -- they have visual meaning, too. Numbers that use 6 and 9 are the most obvious examples, since flipping them upside down retains their full quantity and meaning… 69 is exactly the same right-side up or turned 180 degrees. And why does it matter? Why aren’t strobogrammatic numbers just a trivial curiosity?
There are questions about whether strobogrammatic properties reveal intrinsic value within numbers, but it also presents a pattern worth investigation -- including the subset of strobogrammatic primes. And when’s the next strobogrammatic YEAR? You probably didn’t live through the last one, and you’ve got about 4,000 years before the next one. GOOD LUCK.
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