A300012 - cp's OEIS frontend

A300012 A permutation of the positive integers in which adjacent terms differ by a single prime factor and a(n) has no prime factor exceeding prime(n), having the lexicographically earliest inverse.

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	5
7	10
8	20
9	4
10	28
11	14
12	7
13	77
14	11
15	22
16	44
17	88
18	8
19	24
20	12
21	36
22	18
23	9
24	117
25	39
26	13
27	26
28	52
29	104
30	208
31	16
32	272
33	136
34	68
35	34
36	17
37	323
38	19
39	57
40	399
41	21
42	483
43	69
44	23
45	115
46	575
47	25
48	75
49	225
50	45
51	135
52	27
53	783
54	261
55	87
56	29
57	58

[1, 2, 6, 3, 15, 5, 10, 20, 4, 28, 14, 7, 77, 11, 22, 44, 88, 8, 24, 12, 36, 18, 9, 117, 39, 13, 26, 52, 104, 208, 16, 272, 136, 68, 34, 17, 323, 19, 57, 399, 21, 483, 69, 23, 115, 575, 25, 75, 225, 45, 135, 27, 783, 261, 87, 29, 58]

cp's OEIS Frontend

A300012 A permutation of the positive integers in which adjacent terms differ by a single prime factor and a(n) has no prime factor exceeding prime(n), having the lexicographically earliest inverse.

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	5
7	10
8	20
9	4
10	28
11	14
12	7
13	77
14	11
15	22
16	44
17	88
18	8
19	24
20	12
21	36
22	18
23	9
24	117
25	39
26	13
27	26
28	52
29	104
30	208
31	16
32	272
33	136
34	68
35	34
36	17
37	323
38	19
39	57
40	399
41	21
42	483
43	69
44	23
45	115
46	575
47	25
48	75
49	225
50	45
51	135
52	27
53	783
54	261
55	87
56	29
57	58

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	5
7	10
8	20
9	4
10	28
11	14
12	7
13	77
14	11
15	22
16	44
17	88
18	8
19	24
20	12
21	36
22	18
23	9
24	117
25	39
26	13
27	26
28	52
29	104
30	208
31	16
32	272
33	136
34	68
35	34
36	17
37	323
38	19
39	57
40	399
41	21
42	483
43	69
44	23
45	115
46	575
47	25
48	75
49	225
50	45
51	135
52	27
53	783
54	261
55	87
56	29
57	58

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	5
7	10
8	20
9	4
10	28
11	14
12	7
13	77
14	11
15	22
16	44
17	88
18	8
19	24
20	12
21	36
22	18
23	9
24	117
25	39
26	13
27	26
28	52
29	104
30	208
31	16
32	272
33	136
34	68
35	34
36	17
37	323
38	19
39	57
40	399
41	21
42	483
43	69
44	23
45	115
46	575
47	25
48	75
49	225
50	45
51	135
52	27
53	783
54	261
55	87
56	29
57	58