Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 120: | \[{20^{120}-1\over19}\] | 32 × 7 × 11 × 13 × 31 × 41 × 61 × 127 × 241 × 251 × 401 × 421 × 2801 × 3001 × 12277 × 31177 × 71161 × 148721 × 152381 × 160001 × 222361 × 261451 × 821113 × 22921681 × 55191001 × 167283841 × 26876632021<11> × 4817246650081<13> × 4406613081041681<16> × 16139875689402415201<20> |