Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 30: | \[{31^{30}-1\over30}\] | 25 × 3 × 5 × 72 × 11 × 19 × 41 × 331 × 2521 × 17351 × 21821 × 327412201 × 880374069121<12> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 30: | \[{31^{30}-1\over30}\] | 25 × 3 × 5 × 72 × 11 × 19 × 41 × 331 × 2521 × 17351 × 21821 × 327412201 × 880374069121<12> |