Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 498: | \[{20^{498}-1\over19}\] | 32 × 7 × 127 × 167 × 421 × 499 × 343289 × 9625843 × 530694301087<12> × 27817851030769<14> × 84500260593729961<17> × 2871487521092731391<19> × 414249085636225553185611071<27> × 1538310379327087356765985018066468033557956350069<49> × 83455547904032715573705163300922396904169447963190045702401625064417196564490790868999751009<92> × [54745929312039843707154452502029874131470075873736726218043670494560443088060627920884576002559763613652013258306664316747939802459867970192621791420117650144341605106155575684342995603<185>] × [4452425268074285709901314709887333491590291402304085605891117151166941959929359907463382822652430752240823694739315475091291084615505595514068517081669276795872029093817087857425063904531152566415491315171911519<211>] |