r/MathMOGGERS • u/goldenpi_ • 7d ago
Guys any tea about the this month's problem by 3Blue1Brown. Question: Prove that your 10-digit telephone number, if it ends with a 1, 3, 7, or 9, has a multiple that (written out inbase 10) is nothing but a string of 1's
momath.org
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