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https://mathoverflow.net/questions/510394/identity-with-stirling-numbers-of-the-first-kind
nt.number theory - Identity with Stirling numbers of the first kind - MathOverflow
Let ${n \brack k}$ be the unsigned Stirling numbers of the first kind. With the luck of intuition and after a lot of numerical experiments I conjecture that $$...
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https://mathoverflow.net/questions/509729/identity-using-varphin-dn-and-sigman
nt.number theory - Identity using $\varphi(n), d(n)$ and $\sigma(n)$ - MathOverflow
Let $\varphi(n)$ be the Euler totient function. $d(n)$ be the number of divisors of $n$. $\sigma(n)$ be the sum of the divisors of $n$. $a(n)$ be A344598,...
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