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On the primality of
Authors:Chris K Caldwell  Yves Gallot
Institution:Department of Mathematics and Computer Science, University of Tennessee at Martin, Martin, Tennessee 38238 ; Department of Mathematics and Computer Science, University of Tennessee at Martin, Martin, Tennessee 38238
Abstract:

For each prime $p$, let $p\char93 $ be the product of the primes less than or equal to $p$. We have greatly extended the range for which the primality of $n! \pm 1$ and $p\char93 \pm 1$ are known and have found two new primes of the first form ( $6380!+1, 6917!-1$) and one of the second ($42209\char93 +1$). We supply heuristic estimates on the expected number of such primes and compare these estimates to the number actually found.

Keywords:Prime numbers  factorial primes  primality proving algorithms
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