Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 192: | \[{21^{192}-1\over20}\] | 26 × 11 × 13 × 17 × 61 × 73 × 97 × 193 × 421 × 433 × 463 × 673 × 1217 × 2689 × 3181 × 31873 × 62897 × 97241 × 300673 × 1001713 × 25392481 × 518118697 × 6857635489<10> × 93310250563834657<17> × 226108215051938888394049<24> × 1023263388750334684164671319051311082339521<43> × 4188271851027274266670020743752976432915771677772626012838670551841090107568380000641<85> |