Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 299: | \[{21^{299}-1\over20}\] | 47 × 79 × 2393 × 19597 × 189437 × 516094151 × 1682402437 × 139870566115103282847737<24> × 134128047772101091783603699<27> × 295968034144509472802855739887701691<36> × [69353360881710201890177637529332657170624602569131376082082629377339473147783723884230347486881720663213512926336525917137621844629726392672630664487653198798649334959202344359094572458482004422051674660697867778748313062125310793195022640055581743914019821844549678668189189<275>] |