The assertion concerning binary quadratic forms made by Ramanujan ("Notebook," Vol. 2, p. 311, Tata Institute of Fundamental Research, Bombay, 1957) is proved.

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Journal Journal of Number Theory
Williams, K.S. (1991). On an assertion of Ramanujan concerning binary quadratic forms. Journal of Number Theory, 38(1), 118–133. doi:10.1016/0022-314X(91)90096-T