Restore dataset card links and headline

Restores the white-paper link, adds the UnsolvedMath website link at the top, and keeps the bold total problem count in the dataset headline.

README.md

@@ -16,9 +16,15 @@ size_categories:
 pretty_name: UnsolvedMath
 ---
 
+[🌐 Browse UnsolvedMath online](https://unsolvedmath.com)
+
+[✅ Paper: Open Mathematical Problems as an AI Reasoning Benchmark](https://huggingface.co/datasets/ulamai/UnsolvedMath/blob/main/open-math.pdf)
+
 # UnsolvedMath Dataset
 
-A curated collection of open mathematics problems across all domains and difficulty levels.
+A comprehensive curated collection of **2,084 open mathematics problems** across all domains and difficulty levels, including the largest collection of Erdős problems available in machine-readable format. Available for browsing at [unsolvedmath.com](https://unsolvedmath.com).
+
+Paper: "[Open Mathematical Problems as an AI Reasoning Benchmark](https://huggingface.co/datasets/ulamai/UnsolvedMath/blob/main/open-math.pdf)"
 
 ## Dataset Description
 
@@ -37,6 +43,7 @@ A curated collection of open mathematics problems across all domains and difficu
 ### Dataset Summary
 
 - **Total Problems**: 2084
+- **Erdős Problems**: 632 problems with citations and references
 - **Version**: 1.1.0
 - **Categories**: 17 mathematical domains
 - **Difficulty Levels**: 5 (L1: Tractable → L5: Millennium Prize)
@@ -272,5 +279,5 @@ For questions, issues, or contributions:
 
 ---
 
-**Generated**: 2026-05-13T14:45:21.516Z
+**Generated**: 2026-05-13T14:59:38.597Z
 **Version**: 1.1.0