Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 178: | \[{7^{178}-1\over6}\] | 23 × 179 × 3917 × 18691 × 1805633 × 1179536907057197599849<22> × 18489605314740987765913<23> × 13227717156954615133005062397767019423263773<44> × 8166146875847876762859119015147004762656450569<46> |