Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
74: | \[{31^{74}-1\over30}\] | 25 × 149 × 4219 × 152597832677<12> × 257803457371<12> × 386626708057<12> × 52812493022953<14> × 969963587051157584202299<24> × 488064548082098022956156062559<30> |