Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 142: | \[{7^{142}-1\over6}\] | 23 × 990643452963163<15> × 1351405472411521<16> × 92914860840816888117372433724419584467881183<44> × 169002145064468556765676975247413756542145739<45> |