Mathematics

• 81
• Always divisible by 271
• A hardly known factorization
• Children in a car
• Cos 18°
• Divide by zero
• e, i, π, −1, 0
• Fickle sequences
• Exact gonio table
• Figures
• Infinite roots
• Integer intersections and tangents
• Parabolas
• Prime numbers and prime twins
• Quantized angles in a regular polygon
• A harmonic repeating fraction
• What is math?