Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 470: | \[{20^{470}-1\over19}\] | 3 × 7 × 11 × 61 × 251 × 941 × 1129 × 4889 × 6863 × 28201 × 64109 × 152381 × 38516501 × 314518361 × 488506721 × 2590437431 × 790551835729<12> × 1930941642781<13> × 12435055792744161596491<23> × 87910897915022054334374219609<29> × 3570907310790606926498497128850688711072771837771<49> × 1523201995370741149853911341808474202883334149728543<52> × 3025029944436087394616726666052552348851110911625740117751<58> × 23738284695573674144438598645151629739135537946779044030190169692608001556402094763852500508990141<98> × [46233350533146838844793864533063879306772092215345275417168060592945598245423441981249463928562860142877851964613387892743310152521906414819623967284717361413350699687799399165496082371776751261598580884008273101<212>] |