Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 280: | \[{20^{280}-1\over19}\] | 3 × 72 × 11 × 29 × 41 × 61 × 71 × 197 × 251 × 2812 × 401 × 491 × 617 × 701 × 827 × 911 × 1009 × 2801 × 10529 × 14561 × 17921 × 23311 × 28393 × 32719 × 140281 × 148721 × 152381 × 160001 × 164011 × 222361 × 7003781 × 31585261 × 1424354653 × 5417928377<10> × 175184754697<12> × 4443547135861<13> × 13295107990361<14> × 13428508670641<14> × 4406613081041681<16> × 608569597978252121<18> × 3117271604979239730401<22> × 79228657690280051745653909230106240344858921178050291524688280070544040900255557877330500586028662679142400000000000000160001<125> |