Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
139: | \[{19^{139}-1\over18}\] | 557 × 4567408664461<13> × 263583147847231864141769233<27> × 296879616632104045980025173031883<33> × 84650560425178277439863936324507712229<38> × 18400308407763163578320416527514898832334826932882003375207980883<65> |