I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Remove all the words that end with "ain"
The Goldbach Conjecture
Increment a number, given its digits
Is this triangle right-angled?
Some Assembly Required
It's Happy! It's Fun! It's Happy Fun Hyperball!
High Precision Square Root (Inspired by Project Euler 80)
Breaking Out of the Matrix
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