Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 755: | \[2^{755}-1\] | 31 × 1511 × 18121 × 55871 × 165799 × 2332951 × 15073467791<11> × 286621334502631<15> × 7289088383388253664437433<25> × 328072276230889358448027953221980436262168120353513572759840688545196891029191248042929160470148166585712396327021195979665016800003665048846477940552001<153> |