Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 184: | \[{4^{184}-1\over3}\] | 5 × 17 × 47 × 257 × 277 × 1013 × 1657 × 30269 × 178481 × 2796203 × 43717618369<11> × 549675408461419937<18> × 3970299567472902879791777<25> × 291280009243618888211558641<27> |