Top network posts

• 20 Can you put L trominos to fill the figure?
• 16 An interesting algorithm about prime numbers that I thought today
• 10 How can I prove that starting from $0$, and repeatedly taking $+10,-10,\times10$ or $\div10$, requires at least $9$ operations to get to $2019$?
• 8 I am learning functional equation and encountered $f(f(x)-x)=x$.
• 5 Find values of $x$ so that the matrix is invertible
• 5 $34!=295232799cd96041408476186096435ab000000$, find $a$ ,$b$, $c$, and $d$
• 5 Who has the winning strategy for the game?
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