{"schema":"vela.problem-packet.v0.1","problem":840,"statement":"Let $f(N)$ be the size of the largest quasi-Sidon subset $A\\subset\\{1,\\ldots,N\\}$, where we say that $A$ is quasi-Sidon if\\[\\lvert A+A\\rvert=(1+o(1))\\binom{\\lvert A\\rvert}{2}.\\]How does $f(N)$ grow?","status":"open","seam":"raw","closureRoutes":[],"obligations":[],"attestations":[],"attempts":[],"velaLean":[],"oeis":[],"generated_note":"derived view; the signed event log is the source of truth (vela check / vela reproduce)"}