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Conway chained arrow notation, created by mathematician John Horton Conway, is a means of expressing certain extremely large numbers. It is simply a finite sequence of positive integers separated by rightward arrows, e.g. 2 → 3 → 4 → 5 → 6 {\displaystyle 2\to 3\to 4\to 5\to 6}.
As with most combinatorial notations, the definition is recursive. In this case the notation eventually resolves to being the leftmost number raised to some integer power.
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