Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 66: | \[{4^{66}-1\over3}\] | 3 × 5 × 7 × 13 × 23 × 67 × 89 × 397 × 683 × 2113 × 20857 × 312709 × 599479 × 4327489 |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 66: | \[{4^{66}-1\over3}\] | 3 × 5 × 7 × 13 × 23 × 67 × 89 × 397 × 683 × 2113 × 20857 × 312709 × 599479 × 4327489 |