RSA-155
RSA-155 has 155 decimal digits (512 bits), and was factored on August 22, 1999 by a team led by Herman te Riele and composed of Stefania Cavallar, Bruce Dodson, Arjen K. Lenstra, Walter Lioen, Peter L. Montgomery, Brian Murphy, Karen Aardal, Jeff Gilchrist, Gerard Guillerm, Paul Leyland, Joel Marchand, François Morain, Alec Muffett, Craig Putnam, Chris Putnam and Paul Zimmermann.
The value and factorization is as follows:
RSA-155 = 109417386415705274218097073220403576120037329454492059909138421314763499842889 34784717997257891267332497625752899781833797076537244027146743531593354333897 RSA-155 = 102639592829741105772054196573991675900716567808038066803341933521790711307779 × 106603488380168454820927220360012878679207958575989291522270608237193062808643The factorization was found using the general number field sieve algorithm and an estimated 8000 MIPS-years of computing time.
Read more about this topic: RSA Numbers