Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
679: | \[2^{679}-1\] | 127 × 6791 × 11447 × 59753 × 93703 × 13842607235828485645766393<26> × 1337351764099536062382592381405648316666025584913912478511<58> × 2451100733567925522527673091670682648370765084219128079350970030540433626374624088043739553614894829529<103> |