sentences:  2809 − 1, of 809 bits (244 digits), had its factorisation announced at the start of January 2003.Sieving was done at the CWI, at the Scientific Computing Institute and the Pure Mathematics Department at Bonn University, and using private resources of J. Franke, T. Kleinjung and the family of F. Bahr.The linear algebra step was done by P. Montgomery at SARA in Amsterdam.