@esoterica One of my bugs that really should be better known. As far as I know, there's been zero progress on this problem since Xu's paper. (Open problem: What's the smallest fusible number larger than 3? Open problem that will probably never be answered: What's the smallest fusible number larger than 4?)
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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