Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 199: | \[{20^{199}-1\over19}\] | 121789 × 2140871233499<13> × 797569348705601<15> × 6651512387068883209<19> × [305722966841733981254571985628878513288767322447964279931036255343886456243229841473747470716210933597726925037502221014018036691298645243069808019615448503518527041685845203493833575585277256503914862794579<207>] |