A246681 - cp's OEIS frontend

A246681 Permutation of natural numbers: a(0) = 1, a(1) = 2, a(p_n) = A003961(a(n)), a(c_n) = 2*a(n), where p_n = n-th prime = A000040(n), c_n = n-th composite number = A002808(n), and A003961(n) shifts the prime factorization of n one step towards larger primes.

n	a(n)
0	1
1	2
2	3
3	5
4	4
5	7
6	6
7	9
8	10
9	8
10	14
11	11
12	12
13	15
14	18
15	20
16	16
17	25
18	28
19	21
20	22
21	24
22	30
23	27
24	36
25	40
26	32
27	50
28	56
29	33
30	42
31	13
32	44
33	48
34	60
35	54
36	72
37	45
38	80
39	64
40	100
41	35
42	112
43	75
44	66
45	84
46	26
47	63
48	88
49	96
50	120
51	108
52	144
53	81
54	90
55	160
56	128
57	200
58	70
59	49
60	224
61	99
62	150
63	132
64	168
65	52
66	126
67	55
68	176
69	192
70	240
71	39

[1, 2, 3, 5, 4, 7, 6, 9, 10, 8, 14, 11, 12, 15, 18, 20, 16, 25, 28, 21, 22, 24, 30, 27, 36, 40, 32, 50, 56, 33, 42, 13, 44, 48, 60, 54, 72, 45, 80, 64, 100, 35, 112, 75, 66, 84, 26, 63, 88, 96, 120, 108, 144, 81, 90, 160, 128, 200, 70, 49, 224, 99, 150, 132, 168, 52, 126, 55, 176, 192, 240, 39]

cp's OEIS Frontend

A246681 Permutation of natural numbers: a(0) = 1, a(1) = 2, a(p_n) = A003961(a(n)), a(c_n) = 2*a(n), where p_n = n-th prime = A000040(n), c_n = n-th composite number = A002808(n), and A003961(n) shifts the prime factorization of n one step towards larger primes.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	5
4	4
5	7
6	6
7	9
8	10
9	8
10	14
11	11
12	12
13	15
14	18
15	20
16	16
17	25
18	28
19	21
20	22
21	24
22	30
23	27
24	36
25	40
26	32
27	50
28	56
29	33
30	42
31	13
32	44
33	48
34	60
35	54
36	72
37	45
38	80
39	64
40	100
41	35
42	112
43	75
44	66
45	84
46	26
47	63
48	88
49	96
50	120
51	108
52	144
53	81
54	90
55	160
56	128
57	200
58	70
59	49
60	224
61	99
62	150
63	132
64	168
65	52
66	126
67	55
68	176
69	192
70	240
71	39

n	a(n)
0	1
1	2
2	3
3	5
4	4
5	7
6	6
7	9
8	10
9	8
10	14
11	11
12	12
13	15
14	18
15	20
16	16
17	25
18	28
19	21
20	22
21	24
22	30
23	27
24	36
25	40
26	32
27	50
28	56
29	33
30	42
31	13
32	44
33	48
34	60
35	54
36	72
37	45
38	80
39	64
40	100
41	35
42	112
43	75
44	66
45	84
46	26
47	63
48	88
49	96
50	120
51	108
52	144
53	81
54	90
55	160
56	128
57	200
58	70
59	49
60	224
61	99
62	150
63	132
64	168
65	52
66	126
67	55
68	176
69	192
70	240
71	39

n	a(n)
0	1
1	2
2	3
3	5
4	4
5	7
6	6
7	9
8	10
9	8
10	14
11	11
12	12
13	15
14	18
15	20
16	16
17	25
18	28
19	21
20	22
21	24
22	30
23	27
24	36
25	40
26	32
27	50
28	56
29	33
30	42
31	13
32	44
33	48
34	60
35	54
36	72
37	45
38	80
39	64
40	100
41	35
42	112
43	75
44	66
45	84
46	26
47	63
48	88
49	96
50	120
51	108
52	144
53	81
54	90
55	160
56	128
57	200
58	70
59	49
60	224
61	99
62	150
63	132
64	168
65	52
66	126
67	55
68	176
69	192
70	240
71	39