Top network posts

• 20 Why is $!n\pmod{n+k}$ a multiple of $k+1$ so often?
• 19 Is there a prime every year if YYYYMMDD is treated as a base-$10$ number?
• 12 Is this sequence based on the Fibonacci numbers a prime generator?
• 10 What are the main ideas needed to prove that only $92$ Johnson solids exist?
• 9 Find the smallest integer $n>1$ such that $\frac{1}{n}\left(1+2^2+3^2+\ldots+n^2\right)$ is a perfect square
• 9 I heard there are 48 regular polyhedrons. With what Jan Misali calls regular polyhedrons, are there any more?
• 9 Formula for the area of a rhombus
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