landau-ramanujan constant

In mathematics, the Landau-Ramanujan constant occurs in a number theory result that the proportion of positive integers less than x which are the sum of two square numbers is, for large x, roughly proportional to

1/{\sqrt{\ln(x)}}.

The constant of proportionality is the Landau-Ramanujan constant. More formally, if N(x) is the number of positive integers less than x which are the sum of two squares, then

\lim_{x\rightarrow\infty} \frac{N(x)\sqrt{\ln(x)}}{x}\approx 0.76422365358922066299069873125.

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