Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 280: | \[{13^{280}-1\over12}\] | 23 × 52 × 72 × 11 × 17 × 29 × 41 × 71 × 113 × 211 × 281 × 421 × 601 × 641 × 2411 × 14281 × 22079 × 29881 × 30941 × 654221 × 759641 × 5229043 × 175362601 × 960991081 × 3357897971 × 543124566401<12> × 16566575194331<14> × 23161037562937<14> × 707179356161321<15> × 18603406827218262281<20> × 4803378460849459680406337<25> × 296376064934132422053161022580730249078367228427198561<54> × 98542117049331707365837814692925061564939784267984202281850927032081<68> |