KnowraRamanujan–Nagell equationLinked fromLinked fromThe 2 pages that link to Ramanujan–Nagell equation, each with the reason it gives.All 2Broader topic 1Related 1Diophantine equationBroader topic: Its few solutions illustrate how sharply exponential constraints can restrict integers.Stark–Heegner theoremRelated: Its exceptional solutions connect to the class-number-one field of discriminant −7.