Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 122: | \[{15^{122}-1\over14}\] | 24 × 367 × 7321 × 234519435023<12> × 1805790344137304843<19> × 220692472927167836907173<24> × 66437728342254817921459404330630159646331<41> × 81395548488086772908775498506472824274649<41> |