Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
86: | \[{15^{86}-1\over14}\] | 24 × 173 × 39205337 × 5519984993<10> × 16112471507273<14> × 38664536016220999<17> × 26656068987980386414408582952871386493955339704241<50> |