Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 464: | \[{4^{464}-1\over3}\] | 5 × 17 × 59 × 233 × 257 × 929 × 1103 × 2089 × 5569 × 8353 × 59393 × 65537 × 3033169 × 39594977 × 107367629 × 536903681 × 748264961 × 2245984577 × 239686663718401<15> × 15929619591127520827829953<26> × 82280195167144119832390568177<29> × 6033312171721035031651315652130497<34> × 18774318450142955120650303957350521748903233<44> × 15694604006012505869851221169365594050637743819041<50> |