Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 131: | \[{6^{131}-1\over5}\] | 263 × 3931 × 6551 × 1284827442574221936870974393373403<34> × 19917397922626842334449833677404096613537638684348856178059<59> |