Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 281: | \[{7^{281}-1\over6}\] | 563 × 8431 × 341614931501<12> × 4420135738596254569<19> × 372634096091628229321039358180848549<36> × 41601158252896546668861917466611604127922008421733517<53> × 4452972832512664462610324330367586765969279632656608513136703462044414311710378115419487728065088851204189585921<112> |