Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 191: | \[{31^{191}-1\over30}\] | 383 × 310949 × 80720803 × 6950506607842387499857<22> × 423429076053946275503549<24> × [834241361372134951373548781597026217927041291398912423281881653054499291975850219923996118101009560037080964339548976279055608806254781641756883423131169627311106746282480509664199854765781173292998954250179135009905323637<222>] |