Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 380: | \[{20^{380}-1\over19}\] | 3 × 7 × 11 × 19 × 41 × 61 × 191 × 251 × 401 × 571 × 761 × 2801 × 43321 × 43891 × 152381 × 222361 × 189137401 × 362478049 × 2622927733 × 2741840791 × 75368484119<11> × 109850818001<12> × 192696104561<12> × 328942854011<12> × 1894266356321<13> × 2272727294381<13> × 64100641881631<14> × 1080602296591386315786521<25> × 59457999092908767491225521<26> × 72098698642633148592794795053<29> × 948097092910206388651766804512177141<36> × 23778809377136408734370090877480695484351134455535424041<56> × 5229931928455690333627616430173530402650634066903222987681<58> × 20083957432318794569381189215980062204201613904013022833889557405695572532600985159098137998397950800921<104> |