Top network posts

• 122 An example of a problem which is difficult but is made easier when a diagram is drawn
• 60 If the decimal expansion of $a/b$ contains "$7143$" then $b>1250$
• 57 Is the max of two differentiable functions differentiable?
• 44 A riddle for 2015
• 42 Produce unique number given two integers
• 41 Finding smallest and largest prime factor of $\frac{200!}{180!}$
• 35 Is the equation $\phi(\pi(\phi^\pi)) = 1$ true? And if so, how?
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