Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 488: | \[{4^{488}-1\over3}\] | 5 × 17 × 257 × 733 × 977 × 1709 × 3456749 × 37831175201<11> × 368140581013<12> × 667055378149<12> × 768614336404564651<18> × 2305843009213693951<19> × 4889940029309876547089<22> × 9200725871078697500072796227876997617<37> × 1035817877926014488587133818491976759389034764353<49> × 3002073757428777382273857922385512797763792723266417656025021527116989779952950182556537541850817<97> |