Base 14 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
73: | \[{14^{73}-1\over13}\] | 439 × 7708818770493814043599025468833<31> × 10566980260900333849245254932444354727296796880253<50> |