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A087891号 |
| 从n开始的3x+1轨迹中的非平方项的数量。 |
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2
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0, 0, 3, 1, 3, 3, 6, 2, 8, 3, 6, 4, 5, 6, 7, 3, 6, 9, 8, 4, 5, 6, 7, 5, 10, 5, 38, 7, 8, 7, 36, 4, 12, 6, 7, 10, 9, 8, 12, 5, 37, 5, 13, 7, 9, 7, 36, 6, 11, 11, 10, 6, 7, 39, 40, 8, 14, 8, 12, 8, 9, 36, 36, 5, 13, 12, 11, 7, 8, 7, 36, 11, 41, 9, 9, 9, 10, 12, 13, 6, 11, 37, 40, 6, 7, 13, 12, 8, 12
(列表;图表;参考;听;历史;文本;内部格式)
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偏移
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1,3
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链接
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例子
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n=61:轨迹={61184,92,46,23,70,35,…,20,10,5,16,8,4,2,1},
非平方项={184,92160,80,40,20,16,8,4},因此a(61)=9。
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数学
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c[x_]:=(1-Mod[x,2])*(x/2)+Mod[x,2]*(3*x+1);c[1]=1;fpl[x_]:=删除[FixedPointList[c,x],-1]lf[x_]:=长度[fpl[x]]表[Count[Table[MoebiusMu[Part[fpl][w],j]],{j,1,lf[w]}],0],{w,1,256}]
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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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