Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 253: | \[{19^{253}-1\over18}\] | 277 × 1013 × 2347 × 104281 × 389621 × 62060021 × 16497763013<11> × 1335495402823<13> × 214793493776002373<18> × 8470128728728506401<19> × 279349680370517104441487320645051096067855682982024177837815081045942553927286406961349505055309057872836795655885230456311643959599375929567860168562971587380020962212912174357805868656245168380539448900160490248180235227743402284099469<237> |