Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
581: | \[2^{581}-1\] | 127 × 167 × 798037199 × 175908273685537<15> × 57912614113275649087721<23> × 15444711420006203351165170879848557117713<41> × 2971973409500325953167938550558277137022719033111954012803581886623047449962315856161<85> |