Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | \[{5^{255}-1\over4}\] | 11 × 31 × 71 × 181 × 409 × 1021 × 1531 × 1741 × 90271 × 236641 × 317731 × 466344409 × 654652168021<12> × 782302186051<12> × 38385602257801<14> × 263420722813531<15> × 1445377105917001<16> × 34563155350221618511<20> × 8198241112969626815581<22> × 131872274978634754198635541<27> |