Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 615: | \[{21^{615}-1\over20}\] | 5 × 83 × 211 × 463 × 9391 × 18181 × 36901 × 40841 × 5271781 × 14122861 × 83218931 × 15302729711<11> × 17222085343<11> × 914531249431<12> × 52899783148909<14> × 265476816963668641<18> × 1474011104949958983856849<25> × 367541000424902470501250402608394113<36> × 10534031885860928959842755452634273061203152273<47> × 11485067744219942708886592974523772674194839220685020253423476954547777123419460060388102679004871367799202337124266639742374928164453078749557472220999623096360348281702421577544673717017511<191> × [5096710997897941997470787572864975258694597769086803755005632791811601610107020013841244376438203441235947477519874709669560464513258847463687178599795982829182723383428438641746438191831125917370450261988657322684873097583901408650996890442758321513148038813406049848920655364800106460397432239548896356847756772329046733752968073801193386389217626102982234782826717892578608543676043400928050881077416161<406>] |