Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 278: | \[{19^{278}-1\over18}\] | 22 × 5 × 557 × 40902419 × 4567408664461<13> × 263583147847231864141769233<27> × 296879616632104045980025173031883<33> × 197169025303508469905893274081413111<36> × 1522603842374632207486781206672179673<37> × 84650560425178277439863936324507712229<38> × 18400308407763163578320416527514898832334826932882003375207980883<65> × 22727199936464422424489404390950261257818883268799770651834450353362977075940971210369763627481867<98> |