Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 709: | \[2^{709}-1\] | 216868921 × 1391646221255097953<19> × 8923613716343045335466356955530999435422162663462596131888032215488375825848018829047564287845002013075724298352985234932029074583858040431943816370013577608497700099852955833804395145047<187> |