Extra on concatenation: https://youtu.be/LgnoYsbI7Uc
More links & stuff in full description below ↓↓↓
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Inder J. Taneja papers…
Single Digit Representations of Natural Numbers
https://arxiv.org/abs/1502.03501
Crazy Sequential Representation: Numbers from 0 to 11111 in terms of Increasing and Decreasing Orders of 1 to 9
https://arxiv.org/abs/1302.1479
Videos by Brady Haran
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