Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 551: | \[{4^{551}-1\over3}\] | 59 × 233 × 1103 × 2089 × 4409 × 14327 × 27551 × 174763 × 304153 × 524287 × 3033169 × 400280563 × 645285101497092125181423448604247314765588768947562129943605279670581559927491603930209942828259785826668347306339412962428369301154937689<138> × 15047207907283785223567857264566942009057638990573141456392568106577256738933540911210280244101118007417805328040232877487303293567630046047<140> |