|  |  5.1.117 prime 
See
 general_lib;
 int.Syntax:prime (int_expression)Type:int
Purpose:returns the largest prime less than or equal to the argument; returns 2 for all arguments
smaller than 3.
Example:|  |   prime(320000);
==> 319993
  prime(32004);
==> 32003
  prime(0);
==> 2
  prime(-1);
==> 2
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