Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 213: | \[{8^{213}-1\over7}\] | 73 × 1279 × 66457 × 228479 × 48544121 × 212885833 × 2849881972114740679<19> × 4205268574191396793<19> × 84462210560148142953097<23> × 1329628131546931497103420134367<31> × 28435302301212461494420074814087<32> × 581211581673454706767349073071710126567<39> |