Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[{8^{121}-1\over7}\] | 23 × 89 × 727 × 8713 × 599479 × 7593961 × 75824014993<11> × 1786393878363164227858270210279<31> × 335694389427634954071771421573041823051433281<45> |