Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 326: | \[{21^{326}-1\over20}\] | 2 × 11 × 13693 × 32315729 × 14599604213<11> × 561788105646941<15> × 71382227518918280601812453<26> × 71021669202702868134608700277<29> × 202941857898230649381951459157<30> × 233873265768022293940710651427<30> × 375293848786689453728783544296310281471843370384860719701298799<63> × 358066180208450428471850611470363205439002838918695239044338111081<66> × 23624394860436672961074440125549492456615261234980975872188679386843<68> × 90611348325353380729768610940392497158947491861958750073346962283338593865568389461<83> |