Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 238: | \[{31^{238}-1\over30}\] | 25 × 103 × 239 × 2857 × 11971 × 71821 × 78541 × 917087137 × 11781795397<11> × 2744226674742050863<19> × 6841661642646463343047<22> × 751670559138758105956097<24> × 188793462783207959556320467022417769811681<42> × 25054888960315370919732899676915746704916004311890453878880886612471249251<74> × 2673484072905963425279403748575522050981477588674951678807839850232010414888693188340174590038855339084744897113622927968567994850387<133> |