Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{5^{291}-1\over4}\] | 31 × 389 × 8731 × 264811 × 15247819 × 65482996292971<14> × 425798685220729<15> × 153159805660301568024613754993807288151489686913246436306439<60> × 34611033834995765790775485250424276896925218757932561338298955171420128420674899049543013420771<95> |