Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 242: | \[{20^{242}-1\over19}\] | 3 × 7 × 23 × 740521 × 149810827 × 257277256721<12> × 424016563147<12> × 2431995161971<13> × 10778947368421<14> × 343040240510243<15> × 90903843289299418643<20> × 117785429532952193849308542048142496391181<42> × 318566467273372184139893768342912300044637532496827887<54> × 207460499909279296762540583487933439637201905299100245238682598870759408878141960495778332780218147735503696620877792011<120> |