I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Finding Perfect Squares
Who knows the last digit of pi?
Determine if input is a perfect number
05 - Vector Equations 1
Lowest sum from a group of digits
Highest powers in factorials
Circular Primes (based on Project Euler, problem 35)
Pseudo Square Root (Inspired by Project Euler 266)
Crunch that matrix!
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