matlab解决一下

function  fun3Test()

fun3(1000)

end


function y = fun3(n)

ii = 21;
s = 0;
while ii < n
    if mod(ii,3) == 0  & mod(ii,7) == 0
        s = s + ii;
    end
    ii = ii+3;
end
y = sqrt(s);

end

结果：
ans =

153.9091