Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 86: | \[{19^{86}-1\over18}\] | 22 × 5 × 2753 × 45597803 × 55578787747850091391<20> × 69456939989229889776307<23> × 18917672548149688895557513<26> × 28461948730641665973894996037<29> |