Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
50: | \[{31^{50}-1\over30}\] | 25 × 52 × 11 × 41 × 101 × 1901 × 4951 × 17351 × 21821 × 4726301 × 13277801 × 20235942281002951<17> × 74770514303869505101<20> |