Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 249: | \[{20^{249}-1\over19}\] | 421 × 499 × 27817851030769<14> × 2871487521092731391<19> × 414249085636225553185611071<27> × 1538310379327087356765985018066468033557956350069<49> × [4452425268074285709901314709887333491590291402304085605891117151166941959929359907463382822652430752240823694739315475091291084615505595514068517081669276795872029093817087857425063904531152566415491315171911519<211>] |