Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
129: | \[{20^{129}-1\over19}\] | 421 × 7741 × 815539 × 369122321 × 12541974245083294274833711773684280721275134101<47> × 2911090650711805214708554533530447631300169619646278548725317185365144483897376875368857956362052619<100> |