Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[{20^{177}-1\over19}\] | 421 × 709 × 882346771 × 4480274269<10> × 18822773659<11> × 32031477011<11> × 3287490641844751<16> × 50552666868943321<17> × 473111245352057786521<21> × 4443043113983919668779<22> × 594796417554507257525081<24> × 68202779608555688700931265288320576744876207244539338626143989342216644934362980665271<86> |