Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 275: | \[{21^{275}-1\over20}\] | 52 × 881 × 40841 × 1816651 × 2031851 × 5664205361<10> × 17513875027111<14> × 108529491055396951<18> × 270573999780463721<18> × 27385718497004633851<20> × 54598616218616435702441<23> × [14094172150175844698832115388366814714438409779180738128411918617242580329020728875790041706904230160768488495687780899600274013770353263212873199012830652018916510599033119808748589147070986336128200353192956905084823494005863788089662360901<242>] |