Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
104: | \[{7^{104}-1\over6}\] | 25 × 52 × 53 × 157 × 313 × 1201 × 85094881 × 228511817 × 16148168401<11> × 1195857367853217109<19> × 1377454635342537460935008154217<31> |