A269847 - cp's OEIS frontend

A269847 Permutation of natural numbers: a(1) = 1, for n > 1, if n is an odd prime, a(n) = A003961(a(A000720(n))), otherwise a(n) = 2*a(n-A000720(n)).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	9
8	8
9	10
10	12
11	7
12	18
13	15
14	16
15	20
16	24
17	25
18	14
19	27
20	36
21	30
22	32
23	21
24	40
25	48
26	50
27	28
28	54
29	45
30	72
31	11
32	60
33	64
34	42
35	80
36	96
37	75
38	100
39	56
40	108
41	35
42	90
43	81
44	144
45	22
46	120
47	63
48	128
49	84
50	160
51	192
52	150
53	135
54	200
55	112
56	216
57	70
58	180
59	49
60	162
61	33
62	288
63	44
64	240
65	126
66	256
67	125
68	168
69	320
70	384
71	225
72	300
73	105
74	270
75	400

[1, 2, 3, 4, 5, 6, 9, 8, 10, 12, 7, 18, 15, 16, 20, 24, 25, 14, 27, 36, 30, 32, 21, 40, 48, 50, 28, 54, 45, 72, 11, 60, 64, 42, 80, 96, 75, 100, 56, 108, 35, 90, 81, 144, 22, 120, 63, 128, 84, 160, 192, 150, 135, 200, 112, 216, 70, 180, 49, 162, 33, 288, 44, 240, 126, 256, 125, 168, 320, 384, 225, 300, 105, 270, 400]

cp's OEIS Frontend

A269847 Permutation of natural numbers: a(1) = 1, for n > 1, if n is an odd prime, a(n) = A003961(a(A000720(n))), otherwise a(n) = 2*a(n-A000720(n)).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	9
8	8
9	10
10	12
11	7
12	18
13	15
14	16
15	20
16	24
17	25
18	14
19	27
20	36
21	30
22	32
23	21
24	40
25	48
26	50
27	28
28	54
29	45
30	72
31	11
32	60
33	64
34	42
35	80
36	96
37	75
38	100
39	56
40	108
41	35
42	90
43	81
44	144
45	22
46	120
47	63
48	128
49	84
50	160
51	192
52	150
53	135
54	200
55	112
56	216
57	70
58	180
59	49
60	162
61	33
62	288
63	44
64	240
65	126
66	256
67	125
68	168
69	320
70	384
71	225
72	300
73	105
74	270
75	400

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	9
8	8
9	10
10	12
11	7
12	18
13	15
14	16
15	20
16	24
17	25
18	14
19	27
20	36
21	30
22	32
23	21
24	40
25	48
26	50
27	28
28	54
29	45
30	72
31	11
32	60
33	64
34	42
35	80
36	96
37	75
38	100
39	56
40	108
41	35
42	90
43	81
44	144
45	22
46	120
47	63
48	128
49	84
50	160
51	192
52	150
53	135
54	200
55	112
56	216
57	70
58	180
59	49
60	162
61	33
62	288
63	44
64	240
65	126
66	256
67	125
68	168
69	320
70	384
71	225
72	300
73	105
74	270
75	400

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	9
8	8
9	10
10	12
11	7
12	18
13	15
14	16
15	20
16	24
17	25
18	14
19	27
20	36
21	30
22	32
23	21
24	40
25	48
26	50
27	28
28	54
29	45
30	72
31	11
32	60
33	64
34	42
35	80
36	96
37	75
38	100
39	56
40	108
41	35
42	90
43	81
44	144
45	22
46	120
47	63
48	128
49	84
50	160
51	192
52	150
53	135
54	200
55	112
56	216
57	70
58	180
59	49
60	162
61	33
62	288
63	44
64	240
65	126
66	256
67	125
68	168
69	320
70	384
71	225
72	300
73	105
74	270
75	400