sentences:  In February 2020, the factorization of the 250-digit RSA-250 was completed.12151 − 1, of 542 bits (163 digits), was factored between April and July 1993 by a team at CWI and Oregon State University.2773 + 1, of 774 bits (233 digits), was factored between April and November 2000 by 'The Cabal', with the matrix step done over 250 hours on the Cray also used for RSA-155.