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A295820型 |
| (x,y)=1和x^2+y^2<=n的非负解的个数。 |
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4
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0, 2, 3, 3, 3, 5, 5, 5, 5, 5, 7, 7, 7, 9, 9, 9, 9, 11, 11, 11, 11, 11, 11, 11, 11, 13, 15, 15, 15, 17, 17, 17, 17, 17, 19, 19, 19, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23, 23, 23, 23, 25, 25, 25, 27, 27, 27, 27, 27, 29, 29, 29, 31, 31, 31, 31, 35, 35, 35, 35, 35, 35
(列表;图表;参考;听;历史;文本;内部格式)
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抵消
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0,2
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链接
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配方奶粉
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例子
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(x,y)=1和x^2+y^2<=17的解;
* (1,4)
* * (1,3), (2,3)
* * (1,2), (3,2)
* * * * * (0,1), (1,1), (2,1), (3,1), (4,1)
* (1,0)
a(17)=11。
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数学
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a[n_]:=总和[Boole[GCD[i,j]==1],{i,0,Sqrt[n]},{j,0,Sqrt[n-i^2]}];
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黄体脂酮素
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(PARI)a(n)={sum(i=0,sqrtint(n),sum(j=0,sqrtint(n-i^2),gcd(i,j)==1)}\\安德鲁·霍罗伊德2017年12月12日
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交叉参考
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关键词
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非n
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作者
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状态
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经核准的
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