Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 455: | \[{4^{455}-1\over3}\] | 11 × 31 × 43 × 71 × 127 × 131 × 281 × 911 × 2731 × 8191 × 86171 × 122921 × 131041 × 200201 × 224771 × 409891 × 1210483 × 7623851 × 112901153 × 1185685411 × 23140471537<11> × 25829691707<11> × 39537592800161<14> × 145295143558111<15> × 171525190684121<15> × 327061478509556968075523586322717436918466721<45> × 4774797453608343803270988984332214098351782527747577456028391624903856636676854631<82> |