Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
433: | \[2^{433}-1\] | 22086765417396827057<20> × 737748363812546584876297<24> × 5028667832511715101284999<25> × 270704078857734344240200528055897595961633472511075822112527121<63> |