Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 399: | \[{20^{399}-1\over19}\] | 19 × 29 × 71 × 229 × 421 × 2129 × 32719 × 460951 × 8442733531<10> × 75368484119<11> × 192696104561<12> × 1374892397251<13> × 6174163589791<13> × 12494414195667576859<20> × 2702740716232633935811<22> × 207373637974370334920244263016739<33> × 8776164666072488886789698957877451<34> × 2672419181885638588413640317577254742085726012350062127894360278809061606258187035774281129<91> × 3282319738527107224227521477586694473830074190693824233445849300852505051461520712114169923264855119967941835603878918742690401952140091639899037903033377522106896744925607916402378418839768507146254530743732886064624530692165538624357641429<241> |