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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

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2026_09_04_tienxion: Claims that for j between n/4 and n/2 the number of subgroups of order 2^j in the symmetric group on n letters has base-two logarithm n^2/16 up to O(n log n); a count for one range of orders, not the distribution asked for.