December 30, 2012: version 2.5 - additional factorization files, no code change.

• Additional factorization files further extend the range of searchable exponent beyond the 1200 cut-off of the Cunningham Project. The new factorizations result from combining 2^n - 1 and 2^n + 1 factorizations. The 2^n + 1 factor list is from here, and reformatted with a utility. The plus and minus factorizations were then combined with this utility, and the results were added to the new factor file archive.

source code (from version 2.4)

sample win64 executable built with gcc 4.7.3 compiler.

sample win64 executable built with Microsoft Visual Studio 2010 compiler.