Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 157: | \[{18^{157}-1\over17}\] | 258705857 × 512827566190506799<18> × 53078483693266259467586958497<29> × 7654094002250085598014789228777137123501123152816279<52> × 130540255219385288779246000766807224062385200804940269321446820315264020595807488505774439<90> |