Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 213: | \[{31^{213}-1\over30}\] | 3 × 331 × 853 × 17609 × 24709 × 611127785361198601<18> × 642443809919609072204778169817<30> × 2005748436597103960301617527883393<34> × 37141302977105581064921322418772202338727337015016057<53> × 1413613268986018208953297622812326295096160816132536221892073522923114070700117436686302479232868706025709274958926759395438515840933892337364812335704859054211691130841<169> |