PRIME

     Return an array with the specified number of prime numbers.

     This procedure is similar to PRIMES in the standard IDL distribution,
     but stores results in a common block, and so is much faster

       p = prime(n)

       n = desired number of primes, scalar positive integer

       p = resulting array of primes, vector of positive integers

       prime_com

       Note: Primes that have been found in previous calls are
         remembered and are not regenerated.

       R. Sterner  17 Oct, 1985.
       R. Sterner,  5 Feb, 1993 --- fixed a bug that missed a few primes.
       Converted to IDL V5          March 1999
 Copyright (C) 1985, Johns Hopkins University/Applied Physics Laboratory
 This software may be used, copied, or redistributed as long as it is not
 sold and this copyright notice is reproduced on each copy made.  This
 routine is provided as is without any express or implied warranties
 whatsoever.  Other limitations apply as described in the file disclaimer.txt.

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