Singular Manual: prime

  | ### 5.1.118 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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