Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 88: | \[{7^{88}-1\over6}\] | 25 × 52 × 23 × 89 × 661 × 1123 × 1201 × 1409 × 8713 × 293459 × 10746341 × 83960385389<11> × 8206973609150536446402438593<28> |