Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 393: | \[{4^{393}-1\over3}\] | 3 × 7 × 263 × 787 × 1049 × 4744297 × 36093121 × 51118297 × 58352641 × 182331128681207781784391813611<30> × 7237497065445543055003057643920459<34> × 10350794431055162386718619237468234569<38> × 433685074806886298028919267117655888254843<42> × 9833304614455302578430964280893955512223415028355534287<55> |