A196438 - cp's OEIS frontend

A196438 a(n) is the number of integers k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

n	a(n)
1	0
2	0
3	1
4	1
5	3
6	2
7	5
8	5
9	6
10	7
11	9
12	7
13	11
14	11
15	12
16	13
17	15
18	14
19	17
20	16
21	18
22	19
23	21
24	19
25	23
26	23
27	24
28	25
29	27
30	26
31	29
32	29
33	30
34	31
35	33
36	31
37	35
38	35
39	36
40	36
41	39
42	38
43	41
44	41
45	42
46	43
47	45
48	43
49	47
50	47

[0, 0, 1, 1, 3, 2, 5, 5, 6, 7, 9, 7, 11, 11, 12, 13, 15, 14, 17, 16, 18, 19, 21, 19, 23, 23, 24, 25, 27, 26, 29, 29, 30, 31, 33, 31, 35, 35, 36, 36, 39, 38, 41, 41, 42, 43, 45, 43, 47, 47]

cp's OEIS Frontend

A196438 a(n) is the number of integers k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	3
6	2
7	5
8	5
9	6
10	7
11	9
12	7
13	11
14	11
15	12
16	13
17	15
18	14
19	17
20	16
21	18
22	19
23	21
24	19
25	23
26	23
27	24
28	25
29	27
30	26
31	29
32	29
33	30
34	31
35	33
36	31
37	35
38	35
39	36
40	36
41	39
42	38
43	41
44	41
45	42
46	43
47	45
48	43
49	47
50	47

n	a(n)
1	0
2	0
3	1
4	1
5	3
6	2
7	5
8	5
9	6
10	7
11	9
12	7
13	11
14	11
15	12
16	13
17	15
18	14
19	17
20	16
21	18
22	19
23	21
24	19
25	23
26	23
27	24
28	25
29	27
30	26
31	29
32	29
33	30
34	31
35	33
36	31
37	35
38	35
39	36
40	36
41	39
42	38
43	41
44	41
45	42
46	43
47	45
48	43
49	47
50	47

n	a(n)
1	0
2	0
3	1
4	1
5	3
6	2
7	5
8	5
9	6
10	7
11	9
12	7
13	11
14	11
15	12
16	13
17	15
18	14
19	17
20	16
21	18
22	19
23	21
24	19
25	23
26	23
27	24
28	25
29	27
30	26
31	29
32	29
33	30
34	31
35	33
36	31
37	35
38	35
39	36
40	36
41	39
42	38
43	41
44	41
45	42
46	43
47	45
48	43
49	47
50	47