Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 244: | \[{21^{244}-1\over20}\] | 22 × 11 × 13 × 17 × 367 × 2441 × 15373 × 75641 × 2123777 × 12519763 × 6507039337<10> × 15569711981<11> × 939314334529<12> × 1128331159687<13> × 151583426311021<15> × 132538677158969693<18> × 1814065850324073713<19> × 37376752870606823789<20> × 732829221167645894129<21> × 9600772802405878717656259<25> × 57398774322642953389748085156004642469<38> × 131463780085166148358102805265075200384544766770894622886448240624433366398902783239941643349<93> |