Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 641: | \[{4^{641}-1\over3}\] | 1283 × 32051 × 35897 × 49999 × 139739 × 353833 × 1078163 × 1173835097 × 2401258891949526685926151441<28> × 73819843823154749726309925820314356063695778208135055585507<59> × 745276300734440606226386924312213175677903182797334854064486587296999<69> × 2420161564200739329410254310444778820196576654139080232429544162649795567983079<79> × 18795947089943685289042850201861326689719641302766796883477502913493254840480457593719603600834006204492522841<110> |