A327469 - cp's OEIS frontend

A327469 Number of nonempty subsets of [1..n] which are geometric progressions of length >= 3 with rational ratio and are locally maximal.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	3
10	3
11	3
12	4
13	4
14	4
15	4
16	5
17	5
18	7
19	7
20	8
21	8
22	8
23	8
24	8
25	12
26	12
27	12
28	13
29	13
30	13
31	13
32	14
33	14
34	14
35	14
36	19
37	19
38	19
39	19
40	19
41	19
42	19
43	19
44	20
45	22
46	22
47	22
48	23
49	29
50	33
51	33
52	34
53	34
54	34
55	34
56	34
57	34
58	34
59	34
60	35
61	35
62	35
63	37
64	40
65	40
66	40
67	40
68	41
69	41
70	41
71	41
72	45
73	45
74	45
75	49
76	50
77	50
78	50
79	50
80	51
81	55
82	55
83	55
84	56
85	56
86	56
87	56
88	56
89	56
90	58
91	58
92	59
93	59
94	59
95	59
96	60
97	60
98	66
99	68
100	77

[0, 0, 0, 1, 1, 1, 1, 1, 3, 3, 3, 4, 4, 4, 4, 5, 5, 7, 7, 8, 8, 8, 8, 8, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 19, 19, 19, 19, 19, 19, 19, 19, 20, 22, 22, 22, 23, 29, 33, 33, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 37, 40, 40, 40, 40, 41, 41, 41, 41, 45, 45, 45, 49, 50, 50, 50, 50, 51, 55, 55, 55, 56, 56, 56, 56, 56, 56, 58, 58, 59, 59, 59, 59, 60, 60, 66, 68, 77]

cp's OEIS Frontend

A327469 Number of nonempty subsets of [1..n] which are geometric progressions of length >= 3 with rational ratio and are locally maximal.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	3
10	3
11	3
12	4
13	4
14	4
15	4
16	5
17	5
18	7
19	7
20	8
21	8
22	8
23	8
24	8
25	12
26	12
27	12
28	13
29	13
30	13
31	13
32	14
33	14
34	14
35	14
36	19
37	19
38	19
39	19
40	19
41	19
42	19
43	19
44	20
45	22
46	22
47	22
48	23
49	29
50	33
51	33
52	34
53	34
54	34
55	34
56	34
57	34
58	34
59	34
60	35
61	35
62	35
63	37
64	40
65	40
66	40
67	40
68	41
69	41
70	41
71	41
72	45
73	45
74	45
75	49
76	50
77	50
78	50
79	50
80	51
81	55
82	55
83	55
84	56
85	56
86	56
87	56
88	56
89	56
90	58
91	58
92	59
93	59
94	59
95	59
96	60
97	60
98	66
99	68
100	77

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	3
10	3
11	3
12	4
13	4
14	4
15	4
16	5
17	5
18	7
19	7
20	8
21	8
22	8
23	8
24	8
25	12
26	12
27	12
28	13
29	13
30	13
31	13
32	14
33	14
34	14
35	14
36	19
37	19
38	19
39	19
40	19
41	19
42	19
43	19
44	20
45	22
46	22
47	22
48	23
49	29
50	33
51	33
52	34
53	34
54	34
55	34
56	34
57	34
58	34
59	34
60	35
61	35
62	35
63	37
64	40
65	40
66	40
67	40
68	41
69	41
70	41
71	41
72	45
73	45
74	45
75	49
76	50
77	50
78	50
79	50
80	51
81	55
82	55
83	55
84	56
85	56
86	56
87	56
88	56
89	56
90	58
91	58
92	59
93	59
94	59
95	59
96	60
97	60
98	66
99	68
100	77

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	3
10	3
11	3
12	4
13	4
14	4
15	4
16	5
17	5
18	7
19	7
20	8
21	8
22	8
23	8
24	8
25	12
26	12
27	12
28	13
29	13
30	13
31	13
32	14
33	14
34	14
35	14
36	19
37	19
38	19
39	19
40	19
41	19
42	19
43	19
44	20
45	22
46	22
47	22
48	23
49	29
50	33
51	33
52	34
53	34
54	34
55	34
56	34
57	34
58	34
59	34
60	35
61	35
62	35
63	37
64	40
65	40
66	40
67	40
68	41
69	41
70	41
71	41
72	45
73	45
74	45
75	49
76	50
77	50
78	50
79	50
80	51
81	55
82	55
83	55
84	56
85	56
86	56
87	56
88	56
89	56
90	58
91	58
92	59
93	59
94	59
95	59
96	60
97	60
98	66
99	68
100	77