Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 103: | \[{15^{103}-1\over14}\] | 1031 × 37493 × 507243071 × 96306861556309936387593197402996201073146200561<47> × 519026385414723540853974413380365896722060122651956414117<57> |