Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
205: | \[{7^{205}-1\over6}\] | 83 × 2801 × 20515909 × 4362139336229068656094783<25> × 834035491628067397615971778938263976927180494349982302975033997201<66> × 1688810503833393229216027790837197173108510442605439879635226377154801<70> |