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A140271号 |
| n的最小除数,大于sqrt(n),其中a(1)=1。 |
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36
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1, 2, 3, 4, 5, 3, 7, 4, 9, 5, 11, 4, 13, 7, 5, 8, 17, 6, 19, 5, 7, 11, 23, 6, 25, 13, 9, 7, 29, 6, 31, 8, 11, 17, 7, 9, 37, 19, 13, 8, 41, 7, 43, 11, 9, 23, 47, 8, 49, 10, 17, 13, 53, 9, 11, 8, 19, 29, 59, 10, 61, 31, 9, 16, 13, 11, 67, 17, 23, 10, 71, 9, 73, 37, 15, 19, 11, 13, 79, 10, 27
(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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a(n)是以下几组严格上除数中的最小元素:
1: {1} 16: {8,16} 31: {31}
2: {2} 17: {17} 32: {8,16,32}
3: {3} 18: {6,9,18} 33: {11,33}
4: {4} 19: {19} 34: {17,34}
5: {5} 20: {5,10,20} 35: {7,35}
6: {3,6} 21: {7,21} 36: {9,12,18,36}
7: {7} 22: {11,22} 37: {37}
8: {4,8} 23: {23} 38: {19,38}
9: {9} 24: {6,8,12,24} 39: {13,39}
10: {5,10} 25: {25} 40: {8,10,20,40}
11: {11} 26: {13,26} 41: {41}
12: {4,6,12} 27: {9,27} 42: {7,14,21,42}
13: {13} 28: {7,14,28} 43: {43}
14: {7,14} 29: {29} 44: {11,22,44}
15: {5,15} 30: {6,10,15,30} 45: {9,15,45}
(结束)
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MAPLE公司
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带有(数字理论):
a: =n->min(选择(d->is(d=n或d>sqrt(n)),除数(n)
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数学
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表[选择[Divisors[n],#>Sqrt[n]&][[1],{n,2,70}](*斯特凡·斯坦纳伯格2008年5月18日*)
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黄体脂酮素
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(平价)A140271号(n) ={局部(d,a);d=除数(n);a=n;对于(i=1,长度(d),如果(d[i]>sqrt(n),a=min(d[i,a));a}\\迈克尔·波特2010年4月6日
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交叉参考
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-上级:A051283号,A059172号,A063538号,A063539号,A070038号,A072500型,A116882号,A116883号,A341591,A341592飞机,A341593飞机,A341675型,A341676飞机.
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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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a(70)-a(80)来自雷·钱德勒2009年6月25日
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状态
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经核准的
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