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5.1.117 prime

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
See general_lib; int.
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