RSA-768 is factored!
A six-institution research team led by T. Kleinjung has successfully factored the RSA-768 challenge number. While the RSA Factoring Challenge is no longer active, the factoring of RSA-768 represents a major milestone for the community. The factors were found on December 12, 2009 and reported shortly thereafter. The academic paper describing the work can be found at: http://eprint.iacr.org/2010/006.pdf.
The factors are:
The effort took almost 2000 2.2GHz-Opteron-CPU years according to the submitters, just short of 3 years of calendar time.