I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Sum all integers from 1 to 2^n
How many trades represent all the profit?
Basics: 'Find the eigenvalues of given matrix
What number has this problem?
Don't be mean. Be nice!
Return elements unique to either input
With apologies to William Blake
Pandigital Multiples of 11 (based on Project Euler 491)
Hackathon - String version
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