RSA-220
RSA-220 has 220 decimal digits (729 bits), and has not been factored so far.
RSA-220 = 2260138526203405784941654048610197513508038915719776718321197768109445641817 9666766085931213065825772506315628866769704480700018111497118630021124879281 99487482066070131066586646083327982803560379205391980139946496955261Read more about this topic: RSA Numbers