Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 212: | \[{15^{212}-1\over14}\] | 25 × 107 × 113 × 1697 × 648509 × 4423381 × 6618762113<10> × 80469189271<11> × 144923043227<12> × 19273082604001<14> × 69249662260776479<17> × 2603667389751346537084259<25> × 1628505112656797934760689563<28> × 266257406176802127552803837537<30> × 699303132993397297235043980358642906319705163618646917141738170083096532090488601301<84> |