Erdős problem 9Is the upper density of the set of odd numbers that cannot be expressed as a prime plus two powers of 2 positive?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 96 retained source recordsCanvaspublic previewSource#9→ResultNone→Checks0