Is this triangle right-angled?
The maximum sum of squares
Compute the perimeter of an ellipse
Test the generalized Legendre conjecture
Easy Sequences 35: Cutting a donut to Semi-prime pieces
Easy Sequences 24: Number of Coprime Lattice Points
Easy Sequences 12: 50th Prime
Easy Sequences 29: Odd proper divisors of odd proper divisors
Easy Sequences 7: Easy as Composite Pi
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