Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 85: | \[{15^{85}-1\over14}\] | 11 × 4931 × 1045002649 × 6734509609<10> × 1737312434693929309175606904667659697444924171560401053012526469801639759361<76> |