Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 667: | \[{4^{667}-1\over3}\] | 47 × 59 × 233 × 1103 × 2089 × 12007 × 178481 × 458897 × 2784059 × 2796203 × 3033169 × 25276633 × 88039999 × 77954721883<11> × 246270735864387271375789289856617<33> × 14508653262991734676225669411020750337<38> × 13576064376179168742588336277271314106325956544275716656802613527153022519221499<80> × 5477149091701180500791195545924688410019158130494914431887370714079961680919022089<82> × 78447248939510403238597103326670023020474096781883788452949188981488120758193300064923212988804239<98> |