Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 205: | \[{20^{205}-1\over19}\] | 11 × 61 × 251 × 739 × 821 × 6151 × 50021 × 5161431071215853801<19> × 788985829969499330639<21> × 4752478362400802213658391<25> × 19850094536448035972954342201<29> × 261648499952446890583446919779141151<36> × 9566487000880041822023204591987617730671163933422456784041<58> × 895201452713476062352258362143471145059565666236032313767211<60> |