Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 115: | \[{8^{115}-1\over7}\] | 31 × 47 × 151 × 14951 × 178481 × 4036961 × 10052678938039<14> × 2646507710984041<16> × 162383614111595675973306320509614573241829932932497191<54> |