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• 94 Ways to evaluate $\int \sec \theta \, \mathrm d \theta$
• 67 Prove $0! = 1$ from first principles
• 39 Which is correct: "one or more is" or "one or more are"?
• 36 Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem)
• 32 Proving $\prod_{j=1}^n \left(4-\frac2{j}\right)$ is an integer
• 31 Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?
• 26 Why is $\pi $ equal to $3.14159...$?
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