Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 215: | \[{19^{215}-1\over18}\] | 151 × 431 × 911 × 775676906583182411<18> × 18917672548149688895557513<26> × 28461948730641665973894996037<29> × 34767827087100028553832142305855172668641<41> × 9356125872032561161065854130013550419006958087411959344817263774091<67> × 589783071143701597015505434603593565781950199942595467097772380090363403209256753576151<87> |