Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 851: | \[2^{851}-1\] | 47 × 223 × 178481 × 616318177 × 1530328553290391228929969<25> × 11862938913865507127049391<26> × 717380630460226230305860936849190480084224719404904576848566002303176824107337578481502878716197281526142915571451045986237554671234201774006774449712687051888722024398492314919663183687169<189> |