Count the number of occurrences of "OXO" in rows, columns, diagonals and anti-diagonals.
>> board = ['OOX'
>> board = [' O '
Sums with Excluded Digits
Project Euler: Problem 9, Pythagorean numbers
First non-zero element in each column
Back to basics 26 - Keywords
Modify subscripts - easier
Best Problem Elections
Arithmetic/geometric sequence, 50/50
Polite numbers. N-th polite number.
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