Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 250: | \[{7^{250}-1\over6}\] | 23 × 11 × 191 × 251 × 751 × 2551 × 2801 × 1173001 × 31280679788951<14> × 4833574921448501<16> × 31818863467130251<17> × 79787519018560501<17> × 2182816753758823696751<22> × 23873305978759492963375702715079458905862501<44> × 5903546678356844440204179342119473011887617239565323800435501<61> |