Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 191: | \[{6^{191}-1\over5}\] | 383 × 120477626957<12> × 141173343133408897<18> × 172804791061171733536391399<27> × 7524976737111670763442854695586194776760389436508992259852881065277159715456666540165676887<91> |