Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{28^{291}-1\over27}\] | 3 × 271 × 971 × 11811109 × 1039478191 × 1077512962627<13> × 725580530671927141<18> × 5036445374243515711<19> × 7333547783411359801<19> × 206009914527766361998663844851<30> × 709631467209875315796771044618306561153982255910640419690230176559964795222396960041765720122712469579101140989664777<117> × 12015453195300464128200778643583332524618963241183873589837878911379576546917291946857495479519649269279468015929684318034076935384381578949133873377456199219130553289679452946965183651<185> |