Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 320: | \[{15^{320}-1\over14}\] | 29 × 11 × 17 × 31 × 41 × 113 × 257 × 1201 × 1361 × 1489 × 1531 × 1601 × 2689 × 4931 × 7121 × 19421 × 41281 × 91841 × 131381 × 179953 × 885591361 × 13535373521<11> × 233023054081<12> × 1391359510721<13> × 133390439104361<15> × 12265651175707841<17> × 12779004583099009<17> × 564643374177456961<18> × 5765807395792521302977<22> × 2342027117915665091812321<25> × 90174296490585340781090270145049283410267201<44> × 16770532504740945174315333196049466356881557933971124161<56> × 491605656255513746467394725883931499251725548880155973585281<60> |