Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 311: | \[{8^{311}-1\over7}\] | 37321 × 5344847 × 13129750729<11> × 2647649373910205158468946067671<31> × 188999403857128746828420806061841<33> × 294803681348959296477194164064643062187559537539328375831<57> × 537872590803388379860688160894788978672873866232217018604023263671<66> × 49912538921454325131579030429865305089935512074463061300777106826613804321<74> |