I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Calculate the Levenshtein distance between two strings
Choose the best fitting dominoes
Set the array elements whose value is 13 to 0
Circular Primes (based on Project Euler, problem 35)
Golomb's self-describing sequence (based on Euler 341)
Generate a Parasitic Number
Miles to go before I sleep
Sleeping Queens 1
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