Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 403: | \[{4^{403}-1\over3}\] | 2731 × 6449 × 8191 × 18539 × 45137 × 576759899 × 715827883 × 2147483647 × 8532838289<10> × 153633897920257<15> × 332487941209315679354716083841839125427819013300080110406512328158433464286107<78> × 3049265608323207033354525040420863372400727272926604181336315082400000135598108701713853477087<94> |