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Brahmagupta's problem

From Wikipedia, the free encyclopedia

This problem was given in India by the mathematician Brahmagupta in 628 AD in his treatise Brahma Sputa Siddhanta:

Solve the Pell's equation

for integers .

Brahmagupta gave the smallest solution as

.

See also

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Weisstein, Eric W. "Brahmagupta's Problem". MathWorld.