Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 278: | \[{15^{278}-1\over14}\] | 24 × 557 × 126491 × 124672159 × 12193519519<11> × 402570254679080538585607733<27> × 75474539088975600452493022923034467952752989947695845287554333485123841459249237671767889638680092480568186615136742983361784371<128> × 1232158189388316646964773585212274084192073640748668376062095971824219684443851300838613943422726797675605533236424286951525578535054429056796891<145> |