Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 215: | \[{20^{215}-1\over19}\] | 11 × 61 × 251 × 431 × 9461 × 14621 × 234781 × 4248401 × 369122321 × 4560331031<10> × 57098317360801<14> × 2806376675907539257781<22> × 16382282349203301699052609943551<32> × 341123703105313974607376880614995646376367361<45> × 12541974245083294274833711773684280721275134101<47> × 1463629744199003047595242254167478561504495136622906450988463958940955737371<76> |