Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 157: | \[{21^{157}-1\over20}\] | 94201 × 22283011 × 562990697 × 927769418893<12> × 771665274541267<15> × 6340852464650001524284475768730383408507<40> × 36128673184132773582933876451093687972835000129153707924245857928468744525906461419912826363972237547111359700431261443<119> |