sentences:  All unfactored parts of the numbers 2n − 1 with n between 1000 and 1200 were factored by a multiple-number-sieve approach in which much of the sieving step could be done simultaneously for multiple numbers, by a group including T. Kleinjung, J. Bos and A. K. Lenstra, starting in 2010.To be precise, n=1081 was completed on 11 March 2013; n=1111 on 13 June 2013; n=1129 on 20 September 2013; n=1153 on 28 October 2013; n=1159 on 9 February 2014; 1177 on May 29, 2014, n=1193 on 22 August 2014, and n=1199 on December 11, 2014; the first detailed announcement was made in late August 2014.The total effort for the project is of the order of 7500 CPU-years on 2.2 GHz Opterons, with roughly 5700 years spent sieving and 1800 years on linear algebra.