Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 263: | \[{20^{263}-1\over19}\] | 119929 × 155171 × 646981 × 188128124279701<15> × [34439372912267613798092470820103778727734120889508826294239030353934958555582129503485357726554609895926920815253697781825290037637452396641958081110625958058530627562039080047672384109593236479442450412394297506859207232264600189274676818029068410499889068534190192325737082674739748569036863114402788447804599<311>] |