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• 72 Has anyone heard of this maths formula and where can I find the proof to check my proof is correct? $\sum^n_{i = 1}i + \sum^{n-1}_{i=1}i = n^2$
• 42 Inequality with square roots: $\sqrt{x^2+1}+\sqrt{y^2+1}\ge \sqrt{5}$
• 18 Alternate ways to prove that $4$ divides $5^n-1$
• 16 Prove that the square of any given odd number gives a remainder of 1 when divided by 4
• 16 The milk sharing problem
• 16 How to evaluate $(0.9)^4$ without calculator
• 14 Inequality with square roots: $\sqrt{x^2+1}+\sqrt{y^2+1}\ge \sqrt{5}$
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