Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 659: | \[2^{659}-1\] | 1319 × 11527429277532648241<20> × 626564962613678012662146877852049<33> × 251086738251154096972406810844747949762035524178595675929170915606850110959224676215815898957406470467234237429325630890565682143133147884918697<144> |