Top network posts

• 80 Why are the last two numbers of this sequence never prime?
• 60 Is this a new method for finding powers?
• 53 Any rectangular shape on a calculator numpad when divided by 11 gives an integer. Why?
• 35 Given $P(x)=x^{4}-4x^{3}+12x^{2}-24x+24,$ prove $P(x)=|P(x)|$ for all real $x$
• 32 Solving an equality with 3 equations, and 3 variables
• 31 Can we make it equal to x?
• 23 Suppose $M$ is an $m \times n$ matrix such that all rows and columns of $M$ sum to $1$. Show that $m=n$
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