Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 298: | \[{20^{298}-1\over19}\] | 3 × 7 × 8941 × 17881 × 163901 × 2875786039296613518480371<25> × 36566892400630712197351481<26> × 2873804420787674851207758812143501<34> × 2715398430870915136800487648011341111101<40> × 359650956894840270671011124036564286254529303363586299985258919<63> × 1331941464980121647871378829090875780785418615961853991905930123582988427050369491775672961<91> × 1239094859540391646850133267166414951756710984463954794178330003735400871255583432321065920794109<97> |