Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 781: | \[2^{781}-1\] | 23 × 89 × 228479 × 48544121 × 212885833 × 6511616671913<13> × 66232837958133438967<20> × 79034734517219615663<20> × 370549646190282993458807249710605687589893787382049438311221836912017<69> × 208330322620970625559449619171017280681294575846766796187666540066563147519451746148400079<90> |