Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 391: | \[{8^{391}-1\over7}\] | 47 × 103 × 2143 × 11119 × 37537 × 131071 × 178481 × 428417137 × 10052678938039<14> × 18228580446571609<17> × 403906782348344599<18> × 515878737178649880676177<24> × 25806248225716242845491832244899635927231330561<47> × 4735299062751047834629348947476766642710028552319600543<55> × 920854434270162822283216457951519800254804780099567201431071<60> × 98290646014336142767441265111077381937929560275733866928271124115615704809355542610599<86> |