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Apr 3, 2021 at 17:18 comment added Dominic van der Zypen Thanks for the beautiful observation that $x$ and $x + 111\ldots111$ map to the same value!
Apr 3, 2021 at 17:15 vote accept Dominic van der Zypen
Apr 3, 2021 at 14:12 history answered Daniel S CC BY-SA 4.0