Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 297: | \[{21^{297}-1\over20}\] | 67 × 109 × 163 × 463 × 14851 × 4779433 × 85775383 × 36111365137<11> × 7429452749713<13> × 17513875027111<14> × 20287034274277<14> × 470953595444509<15> × 782006960636353<15> × 146354764854514987<18> × 3955202198062795629622003<25> × 526238816078942095513326138446698207<36> × 188145268678304791443009491673532813732054627291<48> × 3704195404361183444290814706281418081943632713239838367752797924269284707940336523984265448614922419849460427322932986403816872940626622608089229515265774177773<160> |