{"schema":"vela.problem-packet.v0.1","problem":848,"statement":"Is the maximum size of a set $A\\subseteq \\{1,\\ldots,N\\}$ such that $ab+1$ is never squarefree (for all $a,b\\in A$) achieved by taking those $n\\equiv 7\\pmod{25}$?","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)"}