{"schema":"vela.problem-packet.v0.1","problem":764,"statement":"Let $A\\subseteq \\mathbb{N}$. Can there exist some constant $c>0$ such that\\[\\sum_{n\\leq N} 1_A\\ast 1_A\\ast 1_A(n) = cN+O(1)?\\]","status":"solved","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)"}