Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 490: | \[{20^{490}-1\over19}\] | 3 × 73 × 11 × 29 × 61 × 71 × 251 × 491 × 701 × 827 × 911 × 7841 × 10529 × 13721 × 17921 × 23311 × 26951 × 32719 × 152381 × 164011 × 5414011 × 7003781 × 12314191 × 31585261 × 269737651 × 2488859795549<13> × 3688539810341<13> × 4443547135861<13> × 13295107990361<14> × 80827057177254851<17> × 3456439948919462261<19> × 3951515322270922845411912871<28> × 6551154092925933298930251891324599<34> × 31786497905371763489242755077389209545831<41> × 77977622722548466932760552227685032371891<41> × 628292358238289452269193508271835428805485714102857143<54> × 9094531444961429271893502102359397301142152534553291797831<58> × [7889046057784690491609958279907039696389975830836035479180751812048683256241541074145770458904864340037297851349635710187928203707770337408632629486960456875418997444287631141057203868076000757221<196>] |