Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 286: | \[{18^{286}-1\over17}\] | 19 × 23 × 79 × 131 × 199 × 521 × 2081 × 16127 × 38039 × 51217 × 536801 × 712427 × 1977119 × 6301307 × 24806497 × 1120928953 × 4020180841 × 29759719289<11> × 1080002298233<13> × 45456394926471841639167439134165631<35> × 11262115410193327169990297256356379145854303318328010726712701257<65> × 503782732356874285143686800888935038305283168356980176284937631548276153<72> × 44261896455907758584895147529295915429239574374291123631161997294477814694792640847281<86> |