Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[{15^{217}-1\over14}\] | 7 × 311 × 1303 × 1743463 × 24248449 × 82006037 × 1344297430445933606399<22> × 18674505853625546867993<23> × 11357984388650024495137909<26> × 660603097954354915026956925328631<33> × 1433071287096432791033220271946389267<37> × 35469315522392621294648987330116774687<38> × 1235443380005876170832892696267923462242827145481837<52> |