Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
137: | \[{15^{137}-1\over14}\] | 1733873 × 5487280626855094601195734526350955614464668798451340726930635760661138416899900131927755644831564870693051170330885759716928302457851126790355774289060817<154> |