Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 213: | \[{18^{213}-1\over17}\] | 73 × 569 × 1279 × 228337 × 67967023 × 27014686057<11> × 171677613761<12> × 23821298356519<14> × 12252130703953922311<20> × 8313279867213693856690162577<28> × 404888252726379587195529885794129<33> × 711026614284490554933614980152936022174138556036835920163210871<63> × 11065196185413411986547431295308808463159718695654625728614440772943<68> |