Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
191: | \[{8^{191}-1\over7}\] | 383 × 32788207 × 7068569257<10> × 39940132241<11> × 332584516519201<15> × 87274497124602996457<20> × 42918312276547739963203233515530679548769012405746813903417913563204180538169978298970944021468625193389497<107> |