Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 525: | \[{18^{525}-1\over17}\] | 74 × 31 × 41 × 71 × 151 × 449 × 601 × 2711 × 3361 × 11551 × 26881 × 80207 × 558721 × 602401 × 4274201 × 50451031 × 106487551 × 1006771151 × 78180455401<11> × 156107192084257<15> × 6391293850256281<16> × 21162386787273369601<20> × 4164889456901862302881<22> × 142822063586538248694069751<27> × 202389447669713761989042001<27> × 65081321032032689150122343401<29> × 129278406971133461403718040401<30> × 2584370247496860154290248241584011972073735874496310270143807938005181117556112664026633914278733903587304242551<112> × [91036088519165707509164417848804322220042998993032243909382229621899562079399689069451960892088933851349276938838134672283015152976303554396035312656365692774461314784414077815358971499031547501216025717930486664426596762259280142795767741835511364048385520990489777830562001<275>] |