Determine if a Given Number is a Triangle Number
Project Euler: Problem 9, Pythagorean numbers
Number of digits in an integer
Project Euler: Problem 4, Palindromic numbers
Make blocks of color
Find perfect placement of non-rotating dominoes (easier)
Project Euler: Problem 8, Find largest product in a large string of numbers
Is this is a Tic Tac Toe X Win?
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