I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
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Determine if input is a perfect number
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
03 - Matrix Variables 6
Highest powers in factorials
Pandigital Multiples of 11 (based on Project Euler 491)
Community Problem 500!
Rolling maximums above a threshold
Kurchan 5x5 - Optimal Score
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