Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 231: | \[{20^{231}-1\over19}\] | 29 × 71 × 421 × 661 × 859 × 32719 × 460951 × 8442733531<10> × 10778947368421<14> × 35744795971855279<17> × 175462044485240500219<21> × 11591111347512862858060061<26> × 94492701984716091424823399007224633473246602866536721<53> × 39138913132199507495947600247705325602944946553226723264829143232526019048726568203003486009251509340280449319683255125223883079211239768299<140> |