Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 184: | \[{21^{184}-1\over20}\] | 23 × 11 × 13 × 17 × 47 × 277 × 461 × 599 × 691 × 19597 × 97241 × 7522289 × 477045301 × 781621671529<12> × 11918195405621<14> × 2215825387044753577<19> × 139870566115103282847737<24> × 16122157179747873899321928032897737<35> × 2641770975903509717963660601029203121<37> × 2390704756837404868702967945816106086453374158469862895908737073<64> |