Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 446: | \[{4^{446}-1\over3}\] | 5 × 11597 × 18287 × 196687 × 1466449 × 2916841 × 6530333 × 95768689 × 219256122131<12> × 52016435676012089<17> × 6912010464887165201<19> × 1469495262398780123809<22> × 596242599987116128415063<24> × 5150313398606574060240971858429891941<37> × 2705981985587527191852752325795076108854553<43> × 20493495920905043950407650450918171260318303154708405513<56> |