Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 387: | \[{20^{387}-1\over19}\] | 421 × 1549 × 7741 × 51859 × 815539 × 64008001 × 157427731 × 369122321 × 12541974245083294274833711773684280721275134101<47> × 2911090650711805214708554533530447631300169619646278548725317185365144483897376875368857956362052619<100> × [572199962948262100378861161126922683442813790751355250476434572991488476284862615411623218805443833635976966029349030505478396592964825645433509934565271735681488683513214913028156871650871310236761367780645878001991140159047070923777190420422239089272010483331299968744900893008112205656311325291442496568536381<312>] |