Hi all, Version 17.1 (with 2^N+1 ECM factoring and INI files that support a new Time= option) is now available for Linux and Windows NT service users (http://www.mersenne.org/freesoft.htm). To those using the Windows 95 version to do 2^N+1 factoring, you should download a new version. A bug was fixed: stopping a 2^N+1 ECM run incorrectly updated the worktodo.ini file, upon restart the program would start 2^N-1 ECM runs. The source code has also been updated (http://www.mersenne.org/source.htm). Best regards, George