I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Angle between two vectors
Return the first and last characters of a character array
Create matrix of replicated elements
Find the nearest prime number
Singularity v5 (with apologies to the true hack masters)
Still more miles to go before I sleep
Golomb's self-describing sequence (based on Euler 341)
Pandigital Factors (Based on Euler 491)
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