Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 355: | \[{21^{355}-1\over20}\] | 5 × 40841 × 493509073 × 3370794591361<13> × 438083638937411<15> × 1782025430551772145931<22> × 45928043027598356653960601<26> × 3657177827277177583567209871<28> × 6912925952086714539251625713<28> × 110556144297525239244017467747224789359885811468762753179<57> × [35874519613868515485320783201475100555720087531791634410222179397884143027543394055586833398598158400385782008507014126116955141633791429751761005527514548949113545893204871240942740241413004888970005408464251993950193438050452515741341732651482092529163151621129591831<269>] |