Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 89: | \[{15^{89}-1\over14}\] | 179 × 807409 × 18500463452718361<17> × 12556389966735717239290312867405392279627344229633295496808036453334967380715171<80> |