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A321211型 |
| 设S是由这些规则定义的整数集序列:S(1)={1},对于任意n>1,S(n)={n}U S(pi(n))U S(n-pi(n))(其中X U Y表示集合X和Y的并集,pi是素数计数函数);a(n)=S(n)的元素数。 |
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1
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1, 2, 3, 3, 4, 4, 5, 4, 6, 6, 6, 7, 7, 7, 8, 7, 8, 9, 9, 9, 9, 8, 10, 9, 10, 11, 11, 11, 11, 12, 12, 12, 11, 12, 11, 12, 13, 13, 13, 14, 14, 14, 13, 14, 14, 14, 15, 14, 14, 12, 14, 15, 14, 15, 16, 17, 17, 16, 16, 16, 16, 17, 16, 16, 17, 17, 16, 16, 15, 17, 19
(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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1,2
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评论
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链接
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例子
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除pi(n)和S(n)外,第一项是:
n a(n)pi(n)S(n)
-- ---- ----- ----------------------
1 1 0 {1}
2 2 1 {1, 2}
3 3 2 {1, 2, 3}
4 3 2 {1, 2, 4}
5 4 3 {1, 2, 3, 5}
6 4 3 {1, 2, 3, 6}
7 5 4 {1, 2, 3, 4, 7}
8 4 4 {1, 2, 4, 8}
9 6 4 {1, 2, 3, 4, 5, 9}
10 6 4 {1, 2, 3, 4, 6, 10}
11 6 5 {1, 2, 3, 5, 6, 11}
12 7 5 {1, 2, 3, 4, 5, 7, 12}
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黄体脂酮素
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(C++)请参阅链接部分。
(PARI)a(n)=my(v=集合([-1,-n]),i=1);而(v[i]!=-1,my(pi=素数pi(-v[i]]));v=集合并(v,集合([v[i]+pi,-pi]));i++)#v(v)
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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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