Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 142: | \[{15^{142}-1\over14}\] | 24 × 91733 × 5957753 × 5852594044699<13> × 922195312138651<15> × 6713182133980505226300443<25> × 548604883121902124817433729373<30> × 272301574062887284439621057578687<33> × 152648701624697715072344529259283770507<39> |