Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 138: | \[{3^{138}-1\over2}\] | 22 × 7 × 13 × 47 × 139 × 277 × 5107 × 9109 × 132619 × 1476463 × 1001523179 × 23535794707<11> × 2461243576713869557<19> |