Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 973: | \[2^{973}-1\] | 127 × 5625767248687<13> × 2356070859382001284653313<25> × 2166176541500493808960173319<28> × 123876132205208335762278423601<30> × 2587308365024554442155425741275338196287468408002970427422103<61> × 68309683638694819043525603878503735120921715335775505532114837032520866840170310442900777292072333830827718719961607529523122328650647199<137> |