Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
721: | \[2^{721}-1\] | 127 × 2550183799 × 10550281065119153<17> × 3976656429941438590393<22> × 811838362875749000047045370307528756015249707861798385910598024828107320792728313897578386416339056669144506367786420486589665926009785110080921247744211385533548768303<168> |