Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 523: | \[{4^{523}-1\over3}\] | 36667531 × 83207209 × 129175771 × 11694270587<11> × 58052548129<11> × 62802266052329939<17> × 160188778313202118610543685368878688932828701136501444932217468039063<69> × 171417691861249198128317096534322116476165056718630345094896620367860006486977101859504089<90> × 544719662970007779805376120664747628742720078814297043502004257169059582129081332956507664967611<96> |