Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 660: | \[{21^{660}-1\over20}\] | 22 × 5 × 112 × 13 × 17 × 23 × 31 × 41 × 61 × 67 × 89 × 211 × 331 × 421 × 463 × 661 × 881 × 2551 × 2971 × 3181 × 3301 × 3499 × 6073 × 9391 × 18181 × 28513 × 33199 × 39161 × 40841 × 185641 × 372901 × 501001 × 1360861 × 10362529 × 920421641 × 5664205361<10> × 182894303461<12> × 2599537710221<13> × 15944511496321<14> × 17513875027111<14> × 87989435079877<14> × 724051700079313<15> × 1053606939618901<16> × 9036610069262821<16> × 20651477307391591<17> × 28503846834226831<17> × 270573999780463721<18> × 8407123807237422961<19> × 2740213184975849555941<22> × 4718573764413203147069<22> × 54598616218616435702441<23> × 140065954810191667464461<24> × 427340685127009875562001<24> × 3955202198062795629622003<25> × 4260424848188918456751001<25> × 109059874229221664821286941<27> × 3246571517440758538481384401171<31> × 237967900696723393143507690151891<33> × 12445053671159143233988565211478891<35> × 290876372783240399399264359363201321<36> × 107148448424462133146016309681831670177<39> × 59719533016300667659019765187139199581471<41> × [3068076766868463850192659003859215368646513688292549866359791848712090167631516308999090055390744329124386553162576220955132607312207331177455995431084425157341662261<166>] |