Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 371: | \[{4^{371}-1\over3}\] | 43 × 107 × 127 × 743 × 2969 × 6361 × 69431 × 20394401 × 63781899287<11> × 28059810762433<14> × 18351945672220987<17> × 204712366597949333831<21> × 10471846336802440580575859<26> × 90338901802490793533882683<26> × 715302895574501987260955609<27> × 145980337155634444285232523876979318451464756266456641329<57> |