Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
189: | \[{3^{189}-1\over2}\] | 13 × 109 × 433 × 757 × 1093 × 8209 × 368089 × 144542918285300809<18> × 49888641454623789553<20> × 67775349707440873247475442867753<32> |