Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 60: | \[{4^{60}-1\over3}\] | 3 × 52 × 7 × 11 × 13 × 17 × 31 × 41 × 61 × 151 × 241 × 331 × 1321 × 61681 × 4562284561<10> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 60: | \[{4^{60}-1\over3}\] | 3 × 52 × 7 × 11 × 13 × 17 × 31 × 41 × 61 × 151 × 241 × 331 × 1321 × 61681 × 4562284561<10> |