Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
66: | \[{18^{66}-1\over17}\] | 73 × 19 × 23 × 67 × 199 × 307 × 16127 × 25939 × 51217 × 536801 × 6301307 × 7741563936876515923<19> × 12042065697120681040605799<26> |