Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[{8^{217}-1\over7}\] | 7 × 127 × 337 × 1303 × 5209 × 62497 × 2147483647 × 658812288653553079<18> × 6268703933840364033151<22> × 378428804431424484082633<24> × 1191622782866437328993110351<28> × 2626317528364475422451291074871442782545497447474562640041779493971236636466847<79> |