Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 201: | \[{4^{201}-1\over3}\] | 3 × 7 × 1609 × 2011 × 9649 × 22111 × 6324667 × 7327657 × 193707721 × 761838257287<12> × 6713103182899<13> × 59151549118532676874448563<26> × 87449423397425857942678833145441<32> |