Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 386: | \[{20^{386}-1\over19}\] | 3 × 7 × 6949 × 817549 × 1751408411659171<16> × 1921978129885688939<19> × 2336901883696911642748166726552233200431<40> × 743395129164316869525665577319693817035097284345238034426961878946172470558944727352947390616022972186685505892718904201101<123> × 8041742398366322937161083588696100777859712569255579301447955135030659742669949210483995348991092040964461849900673572243143281<127> × 147850605503878902109693220121516169786448660831586466548312866234422765349168621316380958523541199730799684542037134876789198700983775980640380873613949178539071200939<168> |