Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 450: | \[{21^{450}-1\over20}\] | 2 × 52 × 11 × 19 × 31 × 37 × 101 × 151 × 199 × 211 × 421 × 463 × 613 × 1051 × 1801 × 2551 × 9391 × 18181 × 40841 × 92251 × 185641 × 386851 × 501001 × 658261 × 2031851 × 11093851 × 41489011 × 57815101 × 85775383 × 263977951 × 9728219701<10> × 45237496501<11> × 201307465501<12> × 9725237898751<13> × 895322420811001<15> × 22554946693833031<17> × 248303068144516751<18> × 4262607357458385601<19> × 27385718497004633851<20> × 138288178346489520230701<24> × 846605446315436611973101<24> × 82207575664095002495707981<26> × 904997543720474875243278413862398701<36> × 1164847766331259763856928676605541764801227071331178051502907774043159575558388940503465789046082751<100> × 1179421268774440350242515223945549102689082174139857010729575517433940743336138948997490864739177447959643871530549772047101383748878851<136> |