Base 10 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
81: | \[{10^{81}-1\over9}\] | 34 × 37 × 163 × 757 × 9397 × 333667 × 2462401 × 440334654777631<15> × 676421558270641<15> × 130654897808007778425046117<27> |