Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 140: | \[{18^{140}-1\over17}\] | 53 × 11 × 13 × 19 × 29 × 41 × 71 × 211 × 281 × 449 × 1373 × 2711 × 2801 × 9041 × 15101 × 17837 × 80207 × 117251 × 145501 × 1623833 × 3052211 × 4179001 × 4274201 × 32222107 × 4476462481<10> × 22576710941<11> × 29420891411500261<17> × 4164889456901862302881<22> × 3436233498896810902837947821<28> |