Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 141: | \[{7^{141}-1\over6}\] | 3 × 19 × 283 × 5960917 × 13722816749522711<17> × 63681511996418550459487<23> × 285917932930729262773854471418794183208735026049402141999388275408759<69> |