Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 247: | \[{18^{247}-1\over17}\] | 79 × 521 × 4447 × 6841 × 274677833 × 29759719289<11> × 2177365940064685033<19> × 6089884909802812423<19> × 4888947251847866694314121853567862104763504752238685415417745556654597955529596244557047216433722853736580022916644834182092408694100850720612819925111122579784441560918739925929555034920054109095753419024197124262826427050268379531888272897<241> |