Erdős problem 273Is there a covering system all of whose moduli are of the form p−1p-1 for some primes p≥5p \geq 5?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 2733 retained source recordsCanvaspublic previewSource#273→ResultNone→Checks0