Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{15^{91}-1\over14}\] | 7 × 53 × 911 × 157483 × 1743463 × 16655159 × 24002161 × 124074497 × 936800875930739<15> × 1751898328544152699647421291268992709749362876250277<52> |