Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{4^{91}-1\over3}\] | 43 × 127 × 911 × 2731 × 8191 × 224771 × 1210483 × 112901153 × 23140471537<11> × 25829691707<11> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{4^{91}-1\over3}\] | 43 × 127 × 911 × 2731 × 8191 × 224771 × 1210483 × 112901153 × 23140471537<11> × 25829691707<11> |