Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
313: | \[{4^{313}-1\over3}\] | 10960009 × 14787970697180273<17> × 3857194764289141165278097<25> × 26693012026551688286164949958620483258358551879<47> × 5562466239377370006237035693149875298444543026970449921737087520370363869220418099018130434731<94> |