On the primality of n! ± 1 and 2×3×5×...× p±1

  • Authors:
  • Chris K. Caldwell;Yves Gallot

  • Affiliations:
  • Department of Mathematics and Computer Science, University of Tennessee at Martin, Martin, Tennessee;Department of Mathematics and Computer Science, University of Tennessee at Martin, Martin, Tennessee

  • Venue:
  • Mathematics of Computation
  • Year:
  • 2002

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Abstract

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