Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 423: | \[{8^{423}-1\over7}\] | 73 × 2351 × 4513 × 262657 × 13264529 × 4375578271<10> × 13409665391953<14> × 980230389772951<15> × 646675035253258729<18> × 2000007978762572383159<22> × 1617189999730415801728461273583<31> × 65822575300775658772854198368766558032903129506601623<53> × 4054639296059452870934086739488655609338850043863103127<55> × 16759354794116382126548640487565749171438234281397456063337266262797310755823205495622030701926460572271107805135399580486816070597060256489689191<146> |