Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 138: | \[{6^{138}-1\over5}\] | 7 × 31 × 43 × 47 × 139 × 3221 × 11731 × 113958101 × 990000731 × 7505944891<10> × 24648570768391<14> × 816214079084081564521<21> × 1236385853432057889667843739281<31> |