Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 67: | \[{31^{67}-1\over30}\] | 882659 × 447772934301264047325373<24> × 1334574386438395108609084044317<31> × 527131117082818023708828465382157379763<39> |