Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 209: | \[{5^{209}-1\over4}\] | 191 × 419 × 6271 × 56431 × 3981071 × 12207031 × 22077963297690156110122595623297583216190476696803907377343492337000542711435241254425456657076461909793693026506147389<119> |