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In response to the request for an example of a statement that was widely but erroneously believed to be true: does Gauss's conjecture that $\pi(n) < \operatorname{li}(n)$ for every integer $n \in \mathbb{N}$, geq 2$, disproved by Littlewood in 1914, qualify?

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In response to the request for an example of a statement that was widely but erroneously believed to be true: does Gauss's conjecture that $\pi(n) < \operatorname{li}(n)$ for every $n \in \mathbb{N}$, disproved by Littlewood in 1914, qualify?