Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 143: | \[{7^{143}-1\over6}\] | 1123 × 293459 × 16148168401<11> × 528808508322667<15> × 376215890379315997311416372784691746214777<42> × 1111942789781566781299747693078700888402223739<46> |