Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 38: | \[{31^{38}-1\over30}\] | 25 × 191 × 571 × 14251 × 88770666332610762169<20> × 3545592640701962728192781<25> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 38: | \[{31^{38}-1\over30}\] | 25 × 191 × 571 × 14251 × 88770666332610762169<20> × 3545592640701962728192781<25> |