Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 66: | \[{5^{66}-1\over4}\] | 2 × 32 × 7 × 23 × 31 × 67 × 199 × 5281 × 595123 × 12207031 × 190771747 × 386478495679<12> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 66: | \[{5^{66}-1\over4}\] | 2 × 32 × 7 × 23 × 31 × 67 × 199 × 5281 × 595123 × 12207031 × 190771747 × 386478495679<12> |