Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
166: | \[{20^{166}-1\over19}\] | 3 × 7 × 167 × 343289 × 9625843 × 27817851030769<14> × 2871487521092731391<19> × 414249085636225553185611071<27> × 1538310379327087356765985018066468033557956350069<49> × 83455547904032715573705163300922396904169447963190045702401625064417196564490790868999751009<92> |