Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[{16^{121}-1\over15}\] | 23 × 89 × 397 × 683 × 727 × 2113 × 3389 × 91961 × 117371 × 4036962584010807014809213<25> × 11054184582797800455736061107<29> × 1786393878363164227858270210279<31> × 1339272539833668386958920468400193<34> |