Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 231: | \[{18^{231}-1\over17}\] | 74 × 23 × 199 × 449 × 463 × 16127 × 51217 × 80207 × 156107192084257<15> × 1488576527169778147234057<25> × 3985132156298115037385017<25> × 12042065697120681040605799<26> × 4226158024555207354137717207823767090063569445942721682870403141495192673<73> × 766012447493027570237922103194585722024985972878450019247729707427701878868842868267459548289373355479<102> |