Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 251: | \[{20^{251}-1\over19}\] | 4519 × 579521351 × 73227611035992419<17> × [99309012239039219877909590221262938796512974287135749446414882958592232048139950397381017401597859666848084264350892935673966929303520841912286457209177459303208335286912903181895633301709761735260807014808892177848296948902213834742430377106996384679602476682780660971064815927602121335238081511<296>] |