Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[{5^{177}-1\over4}\] | 31 × 198241 × 21180247636732981<17> × 2047572230657338751575051<25> × 340863370420651571324835367261<30> × 14365640833437852408745701299256005364862514221<47> |