Emailing these messages:
argument is not prime
 at SIGS.pl line 16
        main::A(4, 5) called at SIGS.pl line 17
        main::A(3, 4, 5) called at SIGS.pl line 17
        main::A(2, 3, 4, 5) called at SIGS.pl line 17
        main::A(1, 2, 3, 4, 5) called at SIGS.pl line 20