Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 391: | \[{13^{391}-1\over12}\] | 103 × 443 × 1381 × 15798461357509<14> × 12171451754383247<17> × 2519545342349331183143<22> × 11720407803170357585185061<26> × 1872648382774739696393063318869<31> × [443155925834065407755832061413182897028083800609685945286810027380344403027289044378363224709421762641476811663738026050877729629068114002623690039117375614819022710341277613189393492648663706760399955743626522001194650327382925618008263769447017691919177596460494880877536926991431898912156930018845402663302378462849847<321>] |