Ever heard of Kaprekar's Constant? Its really neat.
https://math.hmc.edu/funfacts/kaprekars-constant/
Dattatreya Ramchandra Kaprekar was an Indian school teacher, moonlighting as a recreational math wizard. Or maybe it was the other way round? No idea. Anyway....
...while on one of his mad math paddles, we have what is now known as Kaprekar's Constant.
"A drunkard wants to go on drinking wine to remain in that pleasurable state. The same is the case with me insofar as numbers are concerned." (quote attributed to Mr. Kaprekar)
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