Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 989: | \[2^{989}-1\] | 47 × 431 × 9719 × 31649 × 178481 × 2099863 × 36706221574691349767448834021945679<35> × 1844138946953172296553312102102187271<37> × 33097312876985132371753217611188998871075010011520679704538928142607875307248977216656102691648292848874200261157395673551234620733351925069727649028180687670770804781728837920872840041623798459554143879<203> |