This problem was given in India by the mathematician Brahmagupta in 628 AD in his treatise Brahma Sputa Siddhanta: Solve Pell's equation
x 2 − 92 y 2 = 1 {\displaystyle x^{2}-92y^{2}=1}
for integers x , y > 0 {\displaystyle x,y>0} . Brahmagupta gave the smallest solution as
( x , y ) = ( 1151 , 120 ) {\displaystyle (x,y)=(1151,120)} .
See also Indian mathematics List of Indian mathematicians Indeterminate equation Diophantine equation
External links Weisstein, Eric W. "Brahmagupta's Problem". MathWorld.