Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 355: | \[{8^{355}-1\over7}\] | 31 × 151 × 66457 × 228479 × 48544121 × 212885833 × 121932688511<12> × 2849881972114740679<19> × 4205268574191396793<19> × 14139262262808175798602566204793985440361<41> × 6252200505559391265660834611730277041893919359311<49> × 8223125624363292839815514592697905768406610797334099385507174111379292321<73> × 72377060785877044934985469148457018582544532839595549884952170483099988790442561<80> |