Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 172: | \[{18^{172}-1\over17}\] | 52 × 13 × 19 × 173 × 431 × 8429 × 5129762401<10> × 9581702213<10> × 597455435179<12> × 4464951753212028068412713<25> × 28971751902509263440682681<26> × 16276512351314787405765413256433<32> × 43983075563266931110717441203192765085093<41> × 4497815709101995935577394185688589500494821854381<49> |