Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
78: | \[{7^{78}-1\over6}\] | 23 × 3 × 19 × 43 × 53 × 79 × 486643 × 7524739 × 23850061 × 44975113 × 228511817 × 16148168401<11> × 115868130379<12> |