Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 245: | \[{15^{245}-1\over14}\] | 72 × 11 × 71 × 491 × 4931 × 1743463 × 4167731 × 5706541 × 10164071 × 2053715817301<13> × 4175288799599<13> × 53096945644422356461<20> × 14675999570738648605387<23> × 379935328651372904282683527732514769069394860139340657271377123551465464105864403995126706266483905643307211192754923683436862431757962034599955698956869401175525824149301786586520311<183> |