Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 404: | \[{20^{404}-1\over19}\] | 3 × 7 × 401 × 809 × 9293 × 15959 × 30334543 × 6373585003<10> × 194090053903<12> × 8030086063409<13> × 84385039471114716539234932681<29> × 3812591629152068882611221394389261027451559898877520222267756348987901023<73> × 104123818500013966340837749467994954305411696859064785204861538726061954896128083486074056219855770751881752921491<114> × [21321133661158184751506219021439114042757255359179183349988846789477551307144235680078605917277836715983599444901657798209732373708178108785431987517771545737802304635858517369511108025258159882510345310575193764673881117114723622191401499634775099641773<254>] |