71

This number is a prime.

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71 divides all values of Ackerman's function A(m,n) for sufficiently large m. This is the largest prime less than a million of which this is (known to be) true. (The only other is 13.) [Hartley]

Submitted: 2003-04-07 04:07:43;   Last Modified: 2009-04-06 21:39:54.
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