Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 326: | \[{4^{326}-1\over3}\] | 5 × 653 × 9781 × 150287 × 704161 × 7807049 × 110211473 × 4826612561<10> × 11281292593<11> × 27669118297<11> × 1023398150341859<16> × 36230454570129675721<20> × 337570547050390415041769<24> × 9716134201585679932947173<25> × 11692013098647223345629483497433542615764159168513<50> |