Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 385: | \[{21^{385}-1\over20}\] | 5 × 43 × 631 × 881 × 1471 × 3319 × 40841 × 4149601 × 20028751 × 956464741 × 5664205361<10> × 6225803431<10> × 730256587831<12> × 17513875027111<14> × 24284451772351<14> × 421503321597121<15> × 270573999780463721<18> × 54598616218616435702441<23> × 1070091013783519570173736625221<31> × 39824892937303186001525100993399811<35> × 82721492925050166710438512180782661<35> × [12443038920753557925124715229458077665334327877124979231483028724253594474453102737009094954063577619778323711153221806996622696701642631643830729509110471083755335449105028241659678883702107152813322019402050421080182323648169517619186414363540804889761<254>] |