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Is there a quick method using Sage to find all representations of a given (possible very large) positive integer B as a sum $x_1^2+....+x_n^2$ of exactly $n$ integers $x_i >0$?

Thanks for any help

Is there a quick method using Sage to find all representations of a given (possible very large) positive integer B as a sum $x_1^2+....+x_n^2$ of exactly $n$ integers $x_i >0$?>0$, where we can assume that$x_i \leq x_{i+1}$for all$i$?

Thanks for any help