Is X a Fibonacci Matrix?
Add two numbers
Draw a 'Z'.
Lunar Arithmetic (Addition)
Easy Sequences 22: Sum of Proper Fractions
Easy Sequences 35: Cutting a donut to Semi-prime pieces
Easy Sequences 34: Modified Pascal's Triangle
Easy Sequences 24: Number of Coprime Lattice Points
Easy Sequences 42: Areas of Non-constructible Polygons
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