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The acronym OEIS stands for the On-Line Encyclopedia of Integer Sequences, a well-known database of sequences of integers. It can be used for questions where this database is (or might be) relevant, mainly questions about particular sequences of integers. This tag is typically used in combination with other tags to make the scope of the question more precise; common examples of such tags include the top-level tags co.combinatorics and nt.number-theory.
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 …