Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 375: | \[{21^{375}-1\over20}\] | 53 × 151 × 211 × 251 × 463 × 751 × 1051 × 1801 × 9391 × 18181 × 21001 × 40841 × 2031851 × 9728219701<10> × 10987668001<11> × 13775076001<11> × 201307465501<12> × 2214657701881340251<19> × 27385718497004633851<20> × 138288178346489520230701<24> × 61856751975900984009042515310001<32> × 1022489037962669248379370596767610133652264632743914995422849949035287375154623906974122897251<94> × [11038571284877153699994053181451869023011087943811713916234129560912004748479512655856352654784360077326636924224629466659757983600664099929277738869766765434844603776040743534626861139171756455633210173138105577581132559501<224>] |