A244152 - cp's OEIS frontend

A244152 Self-inverse permutation of natural numbers: a(1) = 1; thereafter, if n is k-th number with an odd number of prime divisors (counted with multiplicity) [i.e., n = A026424(k)], a(n) = A028260(1+a(k)), otherwise, when n is k-th number > 1 with an even number of prime divisors [i.e., n = A028260(1+k)], a(n) = A026424(a(k)).

n	a(n)
1	1
2	4
3	10
4	2
5	24
6	7
7	6
8	55
9	18
10	3
11	16
12	15
13	121
14	44
15	12
16	11
17	39
18	9
19	36
20	35
21	105
22	31
23	250
24	5
25	29
26	28
27	93
28	26
29	25
30	86
31	22
32	82
33	238
34	79
35	20
36	19
37	81
38	72
39	17
40	68
41	218
42	65
43	517
44	14
45	62
46	67
47	60
48	202
49	195
50	57
51	59
52	56
53	185
54	477
55	8
56	52
57	50
58	175
59	51
60	47
61	177
62	45
63	495
64	167
65	42
66	161
67	46
68	40
69	162
70	169
71	150
72	38
73	143
74	455
75	459
76	140
77	153
78	1060
79	34
80	134
81	37
82	32

[1, 4, 10, 2, 24, 7, 6, 55, 18, 3, 16, 15, 121, 44, 12, 11, 39, 9, 36, 35, 105, 31, 250, 5, 29, 28, 93, 26, 25, 86, 22, 82, 238, 79, 20, 19, 81, 72, 17, 68, 218, 65, 517, 14, 62, 67, 60, 202, 195, 57, 59, 56, 185, 477, 8, 52, 50, 175, 51, 47, 177, 45, 495, 167, 42, 161, 46, 40, 162, 169, 150, 38, 143, 455, 459, 140, 153, 1060, 34, 134, 37, 32]

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