Top network posts

• 104 Prove that there are infinitely many primes with $666$ in their decimal representation without Dirichlet's theorem.
• 19 If $\lim_{n \rightarrow \infty} \frac{a_{n+1}}{a_n} = 0$, can $\sum_0^\infty a_n$ be rational?
• 13 Constructing a Möbius strip using a square paper? Is it possible?
• 13 Intuitively, what separates Mersenne primes from Fermat primes?
• 13 Is the sum of all natural numbers countable?
• 11 There cannot be an infinite AP of perfect squares.
• 10 Least prime of the form $38^n+31$
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