Erdős problem 3If A⊂NA \subset \mathbb{N} has ∑n∈A1n=∞\sum_{n \in A}\frac 1 n = \infty, then must A contain arbitrarily long arithmetic progressions?WorkspaceContinue locallyOpen sourceSign in to contributeOpen this exact Problem, source revision, and authority Repository in Workbench. This handoff does not clone, switch, upload, or execute anything.FilesErdős problem 32 retained source recordsCanvaspublic previewSource#3→ResultNone→Checks0