A252757 - cp's OEIS frontend

A252757 Permutation of natural numbers: a(1)=1, and for n>1, if n is k-th number whose largest prime factor is less than the square of its smallest prime factor [i.e., n = A251726(k)], a(n) = 2a(k), otherwise, when n = A251727(k), a(n) = 1 + 2a(k).

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	32
7	64
8	128
9	256
10	3
11	512
12	6
13	1024
14	5
15	12
16	2048
17	10
18	24
19	4096
20	9
21	20
22	17
23	48
24	8192
25	18
26	33
27	40
28	65
29	34
30	129
31	96
32	16384
33	257
34	513
35	36
36	66
37	80
38	7
39	1025
40	13
41	130
42	2049
43	68
44	11
45	258
46	25
47	192
48	32768
49	514
50	4097
51	21
52	49
53	1026
54	72
55	132
56	8193
57	19
58	41
59	160
60	35
61	14
62	97
63	2050
64	26
65	260
66	16385
67	4098
68	37
69	67
70	81
71	136
72	22

[1, 2, 4, 8, 16, 32, 64, 128, 256, 3, 512, 6, 1024, 5, 12, 2048, 10, 24, 4096, 9, 20, 17, 48, 8192, 18, 33, 40, 65, 34, 129, 96, 16384, 257, 513, 36, 66, 80, 7, 1025, 13, 130, 2049, 68, 11, 258, 25, 192, 32768, 514, 4097, 21, 49, 1026, 72, 132, 8193, 19, 41, 160, 35, 14, 97, 2050, 26, 260, 16385, 4098, 37, 67, 81, 136, 22]

cp's OEIS Frontend

A252757 Permutation of natural numbers: a(1)=1, and for n>1, if n is k-th number whose largest prime factor is less than the square of its smallest prime factor [i.e., n = A251726(k)], a(n) = 2a(k), otherwise, when n = A251727(k), a(n) = 1 + 2a(k).

Table of values

List of values

cp's OEIS Frontend

A252757 Permutation of natural numbers: a(1)=1, and for n>1, if n is k-th number whose largest prime factor is less than the square of its smallest prime factor [i.e., n = A251726(k)], a(n) = 2*a(k), otherwise, when n = A251727(k), a(n) = 1 + 2*a(k).

Table of values

List of values

A252757 Permutation of natural numbers: a(1)=1, and for n>1, if n is k-th number whose largest prime factor is less than the square of its smallest prime factor [i.e., n = A251726(k)], a(n) = 2a(k), otherwise, when n = A251727(k), a(n) = 1 + 2a(k).