I was intrigued by this identity, but the straightforward approach scores better in Cody.
Determine if a Given Number is a Triangle Number
Pernicious Anniversary Problem
Find the area of a triangle
Height of a right-angled triangle
Is this is a Tic Tac Toe X Win?
Solve a ballot counting problem
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Set Soldner's constant
Compute Khinchin's constant
Test approximations of the prime counting function
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