Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 991: | \[2^{991}-1\] | 8218291649<10> × 41473350001<11> × 231620367206687<15> × 6721885469050382920298612421830968178768028093133627640714502537112053019071272802490029644416444090606146146238871876925423959<127> × 39437300765327204031983243120992095727633141975484859958380479021870710828340701521806772849536517037509868664540317823526815309243487991<137> |