Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
181: | \[{5^{181}-1\over4}\] | 815663058499815565838786763657068444462645532258620818469829556933715405574685778402862015856733535201783524826169013977050781<126> |