Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 466: | \[{4^{466}-1\over3}\] | 5 × 467 × 1399 × 27961 × 30757 × 135607 × 622577 × 3108221 × 15576974348063186977<20> × 25336594975374725568037<23> × 1137139284834559382500297<25> × 116868129879077600270344856324766260085066532853492178431<57> × 352369374013660139472574531568890678155040563007620742839120913<63> × 888192486543339587170250231534633545752101759653207234833104273<63> |