Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 387: | \[{4^{387}-1\over3}\] | 32 × 7 × 19 × 73 × 431 × 1033 × 9719 × 2099863 × 11492353 × 1591582393 × 2932031007403<13> × 15686603697451<14> × 22763003975641<14> × 6834040335349578249140287<25> × 11053036065049294753459639<26> × 109053678968940302364939183451<30> × 3548950581098263559084652467359<31> × 74511568294243628863306502825698825239868474219<47> |