Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 93: | \[{15^{93}-1\over14}\] | 241 × 311 × 660603097954354915026956925328631<33> × 34327408553153235877683920788486912324029949838354936279201903283843361<71> |