Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 400: | \[{18^{400}-1\over17}\] | 54 × 11 × 13 × 19 × 41 × 97 × 101 × 113 × 401 × 641 × 881 × 929 × 1201 × 2711 × 9041 × 15101 × 18401 × 32801 × 55201 × 102701 × 145501 × 602401 × 738851 × 113607841 × 1437058645425001<16> × 137841514501966721<18> × 246054241904217701<18> × 17254127651933924651<20> × 21162386787273369601<20> × 56992423751374087823201<23> × 23007113434668367286031526391280991361<38> × 9669699494601450679790264365744681226327444801<46> × 48992436948764823420024724203426077695412421761992351587968801<62> × 468052667025229120240256328248248296141641547368406512124868900001<66> × 805217720850532562802175241136805945045041580892773033940529705819970214854195800621715757663201<96> |