Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
193: | \[{5^{193}-1\over4}\] | 749154725101<12> × 406875383561091922623241829<27> × 653307895929756357032069541177270095642284909406860982228674482418078001190973372748580182250689<96> |