I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Back to basics 17 - white space
Back to basics 25 - Valid variable names
Sort numbers by outside digits
03 - Matrix Variables 1
With apologies to William Blake
Rewrite setdiff to account for non-unique values
Golomb's self-describing sequence (based on Euler 341)
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Pandigital Factors (Based on Euler 491)
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