Nil Ratan Bhattacharjee  , Talky Bhattacharjee  , Milan Kanti Dhar  , 
    On Diophantine Equation of Degree Two,
    Journal of Engineering and Applied Sciences,
    Volume 1,Issue 1,
    2006,
    Pages 69-70,
    ISSN 1816-949x,
    jeasci.2006.69.70,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2006.69.70)
    Abstract: Attempt have been made to show that the equation x<SUP>2</SUP> – py<SUP>2</SUP> = -1 is always solvable for integers if P is a prime of the form 4n+1.
    Keywords: Diophantine equation;Quadratic equation;quadratic residue