Join
The largest Sidon set in {1, …, N}
Decide whether the largest Sidon set in {1,…,N} has √N + O(N^ε) elements; the known error term is of order N^{1/4}.
Comparing changes
Choose two branches to see what changed, then open a pull request to bring the work across.
Pick two different branches
A pull request can go from any branch into any other.