Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 264: | \[{21^{264}-1\over20}\] | 23 × 112 × 13 × 17 × 23 × 61 × 67 × 73 × 89 × 353 × 421 × 463 × 661 × 3181 × 3433 × 3499 × 6073 × 28513 × 33199 × 97241 × 10362529 × 313433209 × 518118697 × 715521049 × 17513875027111<14> × 87989435079877<14> × 724051700079313<15> × 29831330140869137<17> × 32775913825604401<17> × 1860536006903334289<19> × 4718573764413203147069<22> × 3955202198062795629622003<25> × 107148448424462133146016309681831670177<39> × 121328963242175651825534959690920155497<39> × 7731601158830082300840040072790267404673299009<46> |