Interpolating on a string (the ASCII values) is an interesting idea even though the long interpolation string could be reduced by subtracting '0', but at the expense of a "longer" solution.
Remove the air bubbles
Who knows the last digit of pi?
Vectorize the digits of an Integer
07 - Common functions and indexing 1
Triangle Numbers Below N
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Project Euler: Problem 16, Sums of Digits of Powers of Two
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