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Answer by Alexander Kalmynin for A conjecture concerning the equation...
Your conjecture is true. Notice first that it is enough to show that $C=p^k$ for some prime $p$. Indeed, in this...
View ArticleA conjecture concerning the equation $\sigma\left(\square\right)=\text{prime}$
I can deduce the following simple proposition, the definitions for $\sigma(x)$ the sum of divisors functions and $\varphi(x)$ the Euler totient function are assumed. After I present a conjecture that...
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