Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 517: | \[{4^{517}-1\over3}\] | 23 × 89 × 283 × 683 × 2351 × 4513 × 82721 × 220243 × 13264529 × 387348809 × 80765938529<11> × 165768537521<12> × 635152101298808699<18> × 1292800939332382943<19> × 270374114136830957955241<24> × 41941878936097554082013916913<29> × 1398877133990750181532404877513<31> × 26302895729179572365768002599674239<35> × 6733513069125713373469792264487998423347380827<46> × 5055472900700718446998992178766514487953008646383<49> |