genrang -r8 9 1 (or any larger n value) seems never to terminate. Keith Dr. Keith M. Briggs Senior Mathematician, Complexity Research Mobility Research Centre, BT http://keithbriggs.info phone: +44(0)1473 work: 641 911 home: 610 517 fax: 642 161 mail: Keith Briggs, Polaris 134, Adastral Park, Martlesham, Suffolk IP5 3RE, UK