Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
619: | \[2^{619}-1\] | 110183 × 710820995447<12> × 109378681671075297195692480234213908123642560192251038455204252439<66> × 253956768073164214501297023118206917309861082669993582450697816383242451115365529071170420452455686291833<105> |