Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
98: | \[{31^{98}-1\over30}\] | 25 × 6959 × 11971 × 71821 × 917087137 × 2932755253 × 147882001432537751112306358052999119715341090542830827<54> × 62322419393153627851729037464684263699383389269055382039663<59> |