Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 550: | \[{21^{550}-1\over20}\] | 2 × 52 × 112 × 23 × 101 × 881 × 2971 × 6073 × 40841 × 185641 × 1816651 × 2031851 × 10362529 × 11093851 × 5664205361<10> × 17513875027111<14> × 108529491055396951<18> × 248303068144516751<18> × 270573999780463721<18> × 8407123807237422961<19> × 27385718497004633851<20> × 54598616218616435702441<23> × 3246571517440758538481384401171<31> × [14094172150175844698832115388366814714438409779180738128411918617242580329020728875790041706904230160768488495687780899600274013770353263212873199012830652018916510599033119808748589147070986336128200353192956905084823494005863788089662360901<242>] × [2778811279927502493663085166205274651114698393707333771755329159366884011887020416087265614891544821889479534663156116412874259178363213250755799770942853623354361504725520253962518419689229110124527260793581502731568879120301461390158293342513538047099751207182001<265>] |