Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 506: | \[{20^{506}-1\over19}\] | 3 × 7 × 232 × 47 × 461 × 691 × 1381 × 106261 × 506507 × 563041 × 1376321 × 107749972661<12> × 424016563147<12> × 10778947368421<14> × 55581069160850861<17> × 3274400525856244223<19> × 9749241054463220311<19> × 46266279097921483078651<23> × 15741999652397070012316049<26> × [199199406899349704800145683447943580807269985050032038242019855025953796085624019433224930854643399354833042044396718381820579528050784121703519246552591189392148207230753986163963532628445462773754654770190603931392862005595557861931<234>] × [907906782000738670082762606668707344731252717440807616060938892893211605868156805729899863434118327993701819077495803254132474801357059066213662433261200947474881151572213891697204668788402262875035608429793045934478433784081114028148487931560658949<249>] |