Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[{7^{177}-1\over6}\] | 3 × 19 × 709 × 89209 × 459257 × 134927809 × 550413361 × 354639323684545612988577649<27> × 22724865586634953261986967832791<32> × 64289143014796069613986636959693464761093760104886421277219<59> |