Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 473: | \[{4^{473}-1\over3}\] | 23 × 89 × 431 × 683 × 947 × 9719 × 2099863 × 8116681 × 12853303 × 2932031007403<13> × 133139883512681<15> × 4304613491867393<16> × 4193551379485561391<19> × 1703616691469833244854254847<28> × 2319326790833455848494271717419<31> × 110790754439643451011977643288649104711084253377796092209089<60> × 52899658439525417701948935772779561657007926055578786642264995029713851<71> |