Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 144: | \[{4^{144}-1\over3}\] | 32 × 5 × 7 × 13 × 17 × 19 × 37 × 73 × 97 × 109 × 193 × 241 × 257 × 433 × 577 × 673 × 1153 × 6337 × 38737 × 65537 × 22253377 × 38941695937<11> × 278452876033<12> × 487824887233<12> |