Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 208: | \[{20^{208}-1\over19}\] | 3 × 7 × 17 × 53 × 401 × 937 × 2081 × 2549 × 3121 × 142559 × 160001 × 502321 × 1961441 × 9690539 × 735408649 × 1505882353 × 24016747632593<14> × 26916259659749909489<20> × 628605693732325702045277<24> × 5689937922777603987891003780559177<34> × 9168671413007132148608076832816409010641713<43> × 359798195117253130530483224037274656876623775584318828454673402521089<69> |