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A057061号 |
| a(n)=包含素数(n)的(R(i,j))的列数,其中R(i、j)是带反对角线1的矩形;2,3; 4,5,6; ... |
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2
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2, 1, 2, 4, 5, 3, 5, 3, 6, 8, 6, 9, 5, 3, 9, 3, 8, 6, 12, 8, 6, 13, 9, 3, 9, 5, 3, 14, 12, 8, 10, 6, 17, 15, 5, 3, 15, 9, 5, 18, 12, 10, 20, 18, 14, 12, 21, 9, 5, 3, 21, 15, 13, 3, 20, 14, 8, 6, 24, 20, 18, 8, 19, 15, 13, 9, 21, 15, 5, 3, 26, 20, 12, 6
(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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1,1
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评论
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矩形R(i,j)有一个角点:
1, 2, 4, 7, 11, 16, 22, 29, ...
3, 5, 8, 12, 17, 23, 30, 38, ...
6, 9, 13, 18, 24, 31, 39, 48, ...
10, 14, 19, 25, 32, 40, 49, 59, ...
15, 20, 26, 33, 41, 50, 60, 71, ...
21, 27, 34, 42, 51, 61, 72, 84, ...
28, 35, 43, 52, 62, 73, 85, 98, ...
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链接
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公式
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例子
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第8个素数19在第3列,所以a(8)=3。
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黄体脂酮素
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(PARI)f(n)=1+二项式(1+楼层(1/2+平方米(2*n)),2)-n\\A004736号
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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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扩展
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状态
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经核准的
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