I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Increment a number, given its digits
Project Euler: Problem 9, Pythagorean numbers
Sophie Germain prime
Replace multiples of 5 with NaN
Length of the hypotenuse
A matrix of introverts
Lowest sum from a group of digits
High Precision Square Root (Inspired by Project Euler 80)
That's some divisor you've got there...
"Find out the best cricket"
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