Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 209: | \[{20^{209}-1\over19}\] | 19 × 419 × 100251449 × 75368484119<11> × 192696104561<12> × 10778947368421<14> × 102780701154470997010739<24> × 8846844832394708765720725272334969<34> × [38116951293421063537215897874744530685348553950687212994399512352854599106027467481016532371047092049464524246320009916488822356338622020102135423055492921421153077861<167>] |