Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 240: | \[{20^{240}-1\over19}\] | 32 × 7 × 11 × 13 × 17 × 31 × 41 × 61 × 127 × 241 × 251 × 401 × 421 × 2801 × 3001 × 12277 × 31177 × 71161 × 76001 × 148721 × 152381 × 160001 × 222361 × 261451 × 821113 × 22921681 × 55191001 × 167283841 × 675796129 × 1505882353 × 3062809441 × 26876632021<11> × 969759919969<12> × 4817246650081<13> × 32018865275041<14> × 4406613081041681<16> × 25944796850595841<17> × 16139875689402415201<20> × 1024292959853371924321<22> × 176495898629033039186561<24> × 2266341143767902155840013360818299201<37> |