Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 249: | \[{15^{249}-1\over14}\] | 241 × 197441665087<12> × 2158116330311<13> × 3220419108264156535849497113<28> × 424091160188578436595274724511088099915436894806250614687<57> × 481081497020571547697024636608330056767195886248881018121464054621<66> × 74383139035683985721901528880732392237157143950624035812239576224599238240378085632054469125439931536578272027585643<116> |