Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 287: | \[{23^{287}-1\over22}\] | 29 × 83 × 5336717 × 1394267813 × 117018989947<12> × 68052468298680356069881<23> × 3337918230492891246392878513<28> × 317018172698691402707105521066838685448001<42> × 1971104784230189724696657672639607383865554087680825963961083017079848660751229162317247641298532310165833263838960568132515990493838006331587769591259490938351634251160524508706084881799753178590788694233398207237470378012427921375252554025920962577142987070824707109<268> |