显示找到的7个结果中的1-7个。
第页1
通过转换x->gcd(x,sigma(x))和x->gcd(x,phi(x),可以从n到达的n的除数。
+10 8
1, 2, 2, 3, 2, 3, 2, 4, 3, 3, 2, 4, 2, 3, 3, 5, 2, 5, 2, 4, 3, 3, 2, 6, 3, 3, 4, 4, 2, 4, 2, 6, 3, 3, 2, 5, 2, 3, 3, 6, 2, 4, 2, 4, 3, 3, 2, 6, 3, 4, 3, 4, 2, 6, 3, 5, 3, 3, 2, 5, 2, 3, 4, 7, 2, 4, 2, 4, 3, 3, 2, 8, 2, 3, 3, 4, 2, 4, 2, 6, 5, 3, 2, 6, 2, 3, 3, 5, 2, 6, 3, 4, 3, 3, 3, 8, 2, 4, 3, 5, 2, 4, 2, 5, 3
评论
因为两者都是A009194号(n) 和A009195号(n) 是n的除数,这意味着从n到达的任何数字也必须是n的除数。当用空的转换序列到达数字n时,它也包含在计数中。
例子
由这两个转换形成的有向无环图,其唯一根为12,如下所示:
12
|
4
| \
| 2
| /
1
黄体脂酮素
(平价)
A326196aux(n,xs)={xs=setunion([n],xs;
基于Eratosthenes筛的非标准因式分解过程中素因子的数量与n的普通因式分解中素因子数量的差异(当以重数计算时):a(n)=A253557型(n)-A001222号(n) ●●●●。
+10 5
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, -1, 1, 0, 1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 2, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 3, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 1
黄体脂酮素
(平价)
up_to=65537;
ordinal_transform(invec)={my(om=Map(),outvec=向量(长度(invec)),pt);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),pt=mapget(om,invec[i];
1, 1, 1, 2, 1, 3, 1, 4, 3, 5, 1, 6, 1, 7, 5, 8, 1, 9, 1, 10, 1, 11, 1, 12, 5, 13, 1, 14, 1, 15, 1, 16, 1, 17, 7, 18, 1, 19, 1, 20, 1, 21, 1, 22, 3, 23, 1, 24, 7, 25, 1, 26, 1, 27, 1, 28, 1, 29, 1, 30, 1, 31, 1, 32, 1, 33, 1, 34, 1, 35, 1, 36, 1, 37, 1, 38, 11, 39, 1, 40, 3, 41, 1, 42, 1, 43, 1, 44, 1, 45, 1, 46, 1, 47, 1, 48, 1, 49, 1, 50, 1, 51, 1, 52, 1
黄体脂酮素
(平价)
up_to=65537;
ordinal_transform(invec)={my(om=Map(),outvec=向量(长度(invec)),pt);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),pt=mapget(om,invec[i];
rgs_transform(invec)={my(om=Map(),outvec=vector(length(invec)),u=1);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),my(pp=mapget(om,invec[i];
0, 1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 2, 2, 4, 1, 3, 1, 3, 2, 2, 1, 4, 2, 2, 2, 3, 1, 3, 1, 5, 2, 2, 2, 4, 1, 2, 2, 4, 1, 3, 1, 3, 3, 2, 1, 5, 2, 3, 2, 3, 1, 3, 2, 4, 2, 2, 1, 4, 1, 2, 2, 6, 2, 3, 1, 3, 2, 3, 1, 5, 1, 2, 2, 3, 2, 3, 1, 5, 3, 2, 1, 4, 2, 2, 2, 4, 1, 4, 2, 3, 2, 2, 2, 6, 1, 3, 2, 4, 1, 3, 1, 4, 3
例子
.
153
/ \
/ \
51 75
/ \ / \
/ 17 \
\ | /
\ 1 /
\ /
\ /
25
|
5
|
1
黄体脂酮素
(平价)
up_to=65537;
ordinal_transform(invec)={my(om=Map(),outvec=向量(长度(invec)),pt);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),pt=mapget(om,invec[i];
rgs_transform(invec)={my(om=Map(),outvec=vector(length(invec)),u=1);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),my(pp=mapget(om,invec[i];
\\速度更快的版本:
memory302042=映射();
A326190list(up_to)={my(v=向量(up_tto));v[1]=0;对于(n=2,up_to,v[n]=1+min(v[A032742号(n) ],v[A302042型(n) ]);(v) ;};
v326190=A326190列表(up_to);
0, 1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 2, 2, 4, 1, 3, 1, 3, 3, 2, 1, 4, 2, 2, 3, 3, 1, 3, 1, 5, 3, 2, 2, 4, 1, 2, 2, 4, 1, 4, 1, 3, 4, 2, 1, 5, 2, 3, 3, 3, 1, 4, 3, 4, 4, 2, 1, 4, 1, 2, 4, 6, 2, 4, 1, 3, 4, 3, 1, 5, 1, 2, 3, 3, 2, 3, 1, 5, 4, 2, 1, 5, 3, 2, 3, 4, 1, 5, 3, 3, 5, 2, 2, 6, 1, 3, 4, 4, 1, 4, 1, 4, 4
例子
.
153
/ \
/ \
51 75
/ \ / \
/ 17 \
\ | /
\ 1 /
\ /
\ /
25
|
5
|
1
黄体脂酮素
(平价)
up_to=65537;
ordinal_transform(invec)={my(om=Map(),outvec=向量(长度(invec)),pt);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),pt=mapget(om,invec[i];
rgs_transform(invec)={my(om=Map(),outvec=vector(length(invec)),u=1);对于(i=1,长度(invesc),如果(mapisdefined(om,invec[i]),my(pp=mapget(om,invec[i];
\\速度稍快:
memo302042=地图();
A302042型(n) =if((1==n)||isprime(n),1,my(v);如果(mapisdefined(memo302042,n,&v),v,my(c)=A078898号(n) ,p=素数(-1+素数(A020639号(n) )+素数(A020639号(c) )),d=A078898号(c) ,k=0);while(d,k++;if(1==k)||(A020639号(k) >=p),d-=1));v=(k*p);地图(备忘录302042,n,v);(v) ));
A326191列表(up_to)={my(v=向量(up_to));v[1]=0;对于(n=2,up_to,v[n]=1+最大值(v[A032742号(n) ],v[A302042型(n) ]);(v) ;};
v326191=A326191列表(up_to);
通过转换x->x-phi(x)和x->gcd(x,phi(x))的某些组合可以从n到达的正整数数。
+10 4
1, 2, 2, 3, 2, 4, 2, 4, 3, 5, 2, 5, 2, 5, 3, 5, 2, 7, 2, 6, 4, 6, 2, 6, 3, 6, 4, 6, 2, 7, 2, 6, 3, 8, 3, 8, 2, 7, 5, 7, 2, 9, 2, 7, 5, 7, 2, 7, 3, 10, 3, 7, 2, 11, 5, 7, 5, 8, 2, 8, 2, 7, 5, 7, 3, 8, 2, 9, 4, 8, 2, 9, 2, 8, 5, 8, 3, 12, 2, 8, 5, 10, 2, 10, 5, 8, 3, 8, 2, 10, 3, 8, 5, 8, 3, 8, 2, 9, 6, 11, 2, 9, 2, 8, 6
例子
由这两个转换形成的有向无环图,其唯一根为12,如下所示:
12
/ \
| 8
\ /
4
|
2
|
1
黄体脂酮素
(平价)
A326198aux(n,xs)=if(vecsearch(xs,n),xs,xs=集合联合([n],xs;如果(1==n,xs,my(a=gcd(n,eulerphi(n)),b=n-eulerpchi(n,n));xs=A326198aux(a,xs);如果((a==b),xs,A326198aux(b,xs));
-1, 0, 0, 1, 0, 5, 0, 3, 1, 7, 0, 14, 0, 9, 8, 7, 0, 18, 0, 20, 10, 13, 0, 32, 1, 15, 4, 26, 0, 41, 0, 15, 14, 19, 12, 49, 0, 21, 16, 46, 0, 53, 0, 38, 30, 25, 0, 68, 1, 38, 20, 44, 0, 57, 16, 60, 22, 31, 0, 106, 0, 33, 38, 31, 18, 77, 0, 56, 26, 73, 0, 111, 0, 39, 44, 62, 18, 89, 0, 98, 13, 43, 0, 138, 22, 45, 32, 88, 0, 141, 20
搜索在0.009秒内完成
查找|欢迎光临|维基|注册|音乐|地块2|演示|索引|浏览|网络摄像头
贡献新序列。或评论|格式|样式表|变换|超级搜索|最近
OEIS社区|维护人OEIS基金会。
许可协议、使用条款、隐私政策。.
上次修改时间:2024年9月23日18:10 EDT。包含376182个序列。(在oeis4上运行。)
|