Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 303: | \[{31^{303}-1\over30}\] | 3 × 331 × 1213 × 4243 × 73529 × 4969807 × 14016781 × 518115053 × 9563980073<10> × 184896218298923<15> × 1599299999412037121<19> × 44399993518101033919<20> × 16586504747470376403950197<26> × [90049602998847875848738045300537966113667087211237109797615476472325128246702489598351596936638133271223542976827978905407256423129116740861617230199544971028789668732559401190967541090755746717894474197330046039585569414325886518603833963918459311357444855308520401586221497906981142278987515629530114217537254280831130728793<326>] |