A375464 - cp's OEIS frontend

A375464 a(n) is the number of nonnegative numbers k < n such that the equation (n-k)*x - k = y^2 is solvable.

n	a(n)
1	1
2	2
3	3
4	3
5	4
6	5
7	4
8	6
9	6
10	5
11	9
12	8
13	5
14	10
15	10
16	8
17	10
18	8
19	10
20	15
21	13
22	6
23	12
24	17
25	7
26	16
27	15
28	11
29	17
30	15
31	14
32	17
33	14
34	13
35	27
36	22
37	6
38	19
39	22
40	20
41	23
42	17
43	13
44	27
45	21
46	15
47	23
48	24
49	16
50	23
51	30
52	21
53	21
54	27
55	26
56	37
57	17
58	7
59	37
60	29
61	22
62	29
63	32
64	24
65	34
66	34
67	15
68	39
69	34
70	19
71	35

[1, 2, 3, 3, 4, 5, 4, 6, 6, 5, 9, 8, 5, 10, 10, 8, 10, 8, 10, 15, 13, 6, 12, 17, 7, 16, 15, 11, 17, 15, 14, 17, 14, 13, 27, 22, 6, 19, 22, 20, 23, 17, 13, 27, 21, 15, 23, 24, 16, 23, 30, 21, 21, 27, 26, 37, 17, 7, 37, 29, 22, 29, 32, 24, 34, 34, 15, 39, 34, 19, 35]

cp's OEIS Frontend

A375464 a(n) is the number of nonnegative numbers k < n such that the equation (n-k)*x - k = y^2 is solvable.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	4
6	5
7	4
8	6
9	6
10	5
11	9
12	8
13	5
14	10
15	10
16	8
17	10
18	8
19	10
20	15
21	13
22	6
23	12
24	17
25	7
26	16
27	15
28	11
29	17
30	15
31	14
32	17
33	14
34	13
35	27
36	22
37	6
38	19
39	22
40	20
41	23
42	17
43	13
44	27
45	21
46	15
47	23
48	24
49	16
50	23
51	30
52	21
53	21
54	27
55	26
56	37
57	17
58	7
59	37
60	29
61	22
62	29
63	32
64	24
65	34
66	34
67	15
68	39
69	34
70	19
71	35

n	a(n)
1	1
2	2
3	3
4	3
5	4
6	5
7	4
8	6
9	6
10	5
11	9
12	8
13	5
14	10
15	10
16	8
17	10
18	8
19	10
20	15
21	13
22	6
23	12
24	17
25	7
26	16
27	15
28	11
29	17
30	15
31	14
32	17
33	14
34	13
35	27
36	22
37	6
38	19
39	22
40	20
41	23
42	17
43	13
44	27
45	21
46	15
47	23
48	24
49	16
50	23
51	30
52	21
53	21
54	27
55	26
56	37
57	17
58	7
59	37
60	29
61	22
62	29
63	32
64	24
65	34
66	34
67	15
68	39
69	34
70	19
71	35

n	a(n)
1	1
2	2
3	3
4	3
5	4
6	5
7	4
8	6
9	6
10	5
11	9
12	8
13	5
14	10
15	10
16	8
17	10
18	8
19	10
20	15
21	13
22	6
23	12
24	17
25	7
26	16
27	15
28	11
29	17
30	15
31	14
32	17
33	14
34	13
35	27
36	22
37	6
38	19
39	22
40	20
41	23
42	17
43	13
44	27
45	21
46	15
47	23
48	24
49	16
50	23
51	30
52	21
53	21
54	27
55	26
56	37
57	17
58	7
59	37
60	29
61	22
62	29
63	32
64	24
65	34
66	34
67	15
68	39
69	34
70	19
71	35