Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 550: | \[{20^{550}-1\over19}\] | 3 × 7 × 112 × 23 × 61 × 101 × 151 × 251 × 1451 × 3301 × 152381 × 319001 × 1369801 × 2209901 × 5232701 × 7466201 × 46794901 × 424016563147<12> × 10778947368421<14> × 261855949927001<15> × 58108806525071501<17> × 2571413672161047121<19> × 1038193734970398415809901<25> × 167103718909962607171187251<27> × 2057070246891007436467965301<28> × 5824150755268660571603114951<28> × 1293445697691463317334319811114401<34> × 11544868483876542417134734645670674427914239932800021<53> × 7149178609090413866906053214347885837967359618983397752625907940822341522834351<79> × 6170114791549662382262314486441296495950426552131877116459658638129206990452223036571824340060144328701<103> × [450558360346951973167589406200088419109009856386655390224807431864345001275329914966909208329847858689606237043260867042285570198948125469392745004829821624490650110910216987744647410601525599470289806301<204>] |