A365047 - cp's OEIS frontend

A365047 a(n) is the number of three-term geometric progressions, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k) and a(n-1-2k), where k >= 1 and n - 1 - 2k >= 0.

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

[0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 2, 0, 0, 2, 0, 3, 0, 4, 2, 0, 0, 4, 1, 0, 1, 0, 2, 1, 0, 3, 0, 5, 0, 4, 1, 0, 2, 0, 2, 0, 5, 0, 4, 1, 3, 0, 4, 1, 1, 1, 2, 1, 4, 2, 0, 4, 1, 0, 3, 0, 3, 0, 2, 2, 1, 4, 0, 5, 0, 3, 0, 6, 0, 3, 1, 3, 0, 5, 0, 6, 0, 5, 0, 6, 0, 6, 0, 8, 0, 8, 0, 9, 1, 2, 1, 1, 2]

cp's OEIS Frontend

A365047 a(n) is the number of three-term geometric progressions, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k) and a(n-1-2k), where k >= 1 and n - 1 - 2k >= 0.

Table of values

List of values

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

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

cp's OEIS Frontend

A365047 a(n) is the number of three-term geometric progressions, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k) and a(n-1-2*k), where k >= 1 and n - 1 - 2*k >= 0.

Table of values

List of values

A365047 a(n) is the number of three-term geometric progressions, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k) and a(n-1-2k), where k >= 1 and n - 1 - 2k >= 0.

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