Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{20^{220}-1\over19}\] | 3 × 7 × 112 × 23 × 41 × 61 × 89 × 251 × 401 × 2801 × 27281 × 152381 × 222361 × 2209901 × 58175508161<11> × 170770770413<12> × 424016563147<12> × 4574753733001<13> × 6881957521693<13> × 10778947368421<14> × 2571413672161047121<19> × 167103718909962607171187251<27> × 11544868483876542417134734645670674427914239932800021<53> × 16692286997463922327227308426128654402516175344724659094980749208326493184761<77> |