Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 148: | \[{18^{148}-1\over17}\] | 52 × 13 × 19 × 149 × 1259 × 1481 × 3257 × 157991 × 245916653 × 2790448537 × 10763275729<11> × 647596604061431090273<21> × 695043435263187098609152525830197<33> × 10375318069755905859690041706382489471961<41> × 1164939463722239475169554761379636729267089<43> |