Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{15^{291}-1\over14}\] | 241 × 373115933 × 165984138349<12> × 3385663183327<13> × 1938177886827124931<19> × 211727039173815789139263712464214518933075943626165409606172029<63> × 6021257693449522390700850137889420917642830367061829399286346723416443020266244925261543417160593713190310524610253809850689795384253019695666821536121163006962400053063590813908764614283954609557995316669097579861082971343361<226> |