Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 505: | \[{4^{505}-1\over3}\] | 11 × 31 × 8081 × 223211 × 6909226326451<13> × 7432339208719<13> × 46393668925691<14> × 145130814068214641<18> × 341117531003194129<18> × 1025698740064276331<19> × 1906785849099933631<19> × 727679956595455269121<21> × 59970388037871582350272399931<29> × 845100400152152934331135470251<30> × 698963720154843264243253784220387078257259218502563908013880224534654264461065235983821688087336215521<102> |