Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 405: | \[{15^{405}-1\over14}\] | 11 × 61 × 109 × 163 × 181 × 241 × 541 × 1621 × 4931 × 21061 × 16354441 × 39225301 × 238123801 × 829049498029<12> × 19702654674841<14> × 5105451444569239321<19> × 92978587355640205970336221<26> × 199163133217862162773842455856459620733246841<45> × 19803428495911816157659521610469429585428513632230232098351227<62> × 66977501254444610543069273622213053046367612113620892455139452976388188739937951395542714156757583440414646907540803423780905817351850944255704598821361612601245758161839958625318014590386598244577075890630289076900069628430386050615834277916072254781<251> |