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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

9 votes

Computationally challenging integer sequences

How about busy beaver numbers. I think the first 5 are known, and there are very large lower bounds for the 6th and 7th, which may already be uncomputible. The sequence definitely becomes uncomputab …
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