Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 209: | \[{31^{209}-1\over30}\] | 23 × 397 × 571 × 617 × 14251 × 150332843 × 224531627 × 5957505709<10> × 964279537211<12> × 88770666332610762169<20> × 171106718558612865601<21> × 122194721849011158851300445378114678377068248839122953090283691214697077951438761638190217307951822103888354603049500749129951221831951871558325049432873522776075152107274557362091801875981580056729591246090294549167837<219> |