Top network posts

• 41 Is there any other number that has similar properties as $21$?
• 27 Can a sum of consecutive $n$th powers ever equal a power of two?
• 14 Does this sequence reach infinity?
• 11 Interesting thing about sum of squares of prime factors of $27$ and $16$.
• 10 Do the squares of an arithmetic progression ever sum to a power of three?
• 7 show that $n\Upsilon_{n-1} \equiv -1 \pmod{n}$ iff $n$ is prime
• 7 Sum of the digits in base $p+1$
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