Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 213: | \[{15^{213}-1\over14}\] | 241 × 91733 × 5957753 × 203053327 × 272301574062887284439621057578687<33> × 152648701624697715072344529259283770507<39> × 3051499356992774544438864682851430854369764738351568149455508117517206287<73> × 677358134706902199287462056239579828276113909947346005814622497423291181003709476289<84> |