Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 247: | \[{15^{247}-1\over14}\] | 53 × 157483 × 4272113 × 16655159 × 370649274902657<15> × 101332494231224451511276033905193003940785455835866519666970597066573925780338986923130508020893788336881921173560510623951404321896810458426197287510988730989562200992794827113291948987507302370913567644733491788090060003931818572000774334115726318359361<255> |