How many ways to represent a number with sum of four number squares?
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i too dnt know if u know please tell me
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The number of representations of  by  squares, allowing zeros and distinguishing signs and order, is denoted . The special case  corresponding to two squares is often denoted simply  (e.g., Hardy and Wright 1979, p. 241; Shanks 1993, p. 162).
For example, consider the number of ways of representing 5 as the sum of two squares:
For example, consider the number of ways of representing 5 as the sum of two squares:
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