Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 181: | \[{7^{181}-1\over6}\] | 1811 × 13873726021<11> × 618805947190964867<18> × 364308807786322943430987769<27> × 27005876544550710552891977621526546848074872104863368764918778875605048701154644212247756598477<95> |