Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 229: | \[{3^{229}-1\over2}\] | 8047106008391<13> × 32356561399076305309<20> × 284663996630519253661<21> × 634538541879036040523<21> × 193795952251956993033428990650021813<36> |