Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 991: | \[{4^{991}-1\over3}\] | 3060209 × 5819153 × 8218291649<10> × 41473350001<11> × 231620367206687<15> × 3122895040527689387017<22> × 7785692962749707974896202971851600869561<40> × 117629529942758313311719273856832197673938841177863540264141636175964038817<75> × 6721885469050382920298612421830968178768028093133627640714502537112053019071272802490029644416444090606146146238871876925423959<127> × 39437300765327204031983243120992095727633141975484859958380479021870710828340701521806772849536517037509868664540317823526815309243487991<137> × 136969087297569134279113704473135335454160626606816036003114734862457954002771925683114138902084741850922146127162274014967311278305998518633856242251<150> |