A216673 - cp's OEIS frontend

A216673 Total number of solutions to the equation x^2 + k*y^2 = n with x >= 0, y >= 0, k > 0, or 0 if the number is infinite. (Order does not matter for the equation x^2 + y^2 = n).

n	a(n)
1	0
2	2
3	2
4	0
5	3
6	3
7	3
8	5
9	0
10	4
11	4
12	6
13	6
14	4
15	4
16	0
17	7
18	7
19	6
20	8
21	7
22	6
23	5
24	8
25	0
26	6
27	8
28	10
29	9
30	6
31	7
32	11
33	10
34	8
35	6
36	0
37	11
38	7
39	7
40	12
41	12
42	7
43	9
44	11
45	13
46	8
47	7
48	13
49	0
50	10
51	9
52	16
53	12
54	12
55	9
56	12
57	14
58	10
59	9
60	12
61	15
62	8
63	11
64	0
65	15
66	10
67	11
68	16
69	13
70	11
71	9
72	19
73	18
74	10
75	11
76	18
77	13

[0, 2, 2, 0, 3, 3, 3, 5, 0, 4, 4, 6, 6, 4, 4, 0, 7, 7, 6, 8, 7, 6, 5, 8, 0, 6, 8, 10, 9, 6, 7, 11, 10, 8, 6, 0, 11, 7, 7, 12, 12, 7, 9, 11, 13, 8, 7, 13, 0, 10, 9, 16, 12, 12, 9, 12, 14, 10, 9, 12, 15, 8, 11, 0, 15, 10, 11, 16, 13, 11, 9, 19, 18, 10, 11, 18, 13]

cp's OEIS Frontend

A216673 Total number of solutions to the equation x^2 + k*y^2 = n with x >= 0, y >= 0, k > 0, or 0 if the number is infinite. (Order does not matter for the equation x^2 + y^2 = n).

Table of values

List of values

n	a(n)
1	0
2	2
3	2
4	0
5	3
6	3
7	3
8	5
9	0
10	4
11	4
12	6
13	6
14	4
15	4
16	0
17	7
18	7
19	6
20	8
21	7
22	6
23	5
24	8
25	0
26	6
27	8
28	10
29	9
30	6
31	7
32	11
33	10
34	8
35	6
36	0
37	11
38	7
39	7
40	12
41	12
42	7
43	9
44	11
45	13
46	8
47	7
48	13
49	0
50	10
51	9
52	16
53	12
54	12
55	9
56	12
57	14
58	10
59	9
60	12
61	15
62	8
63	11
64	0
65	15
66	10
67	11
68	16
69	13
70	11
71	9
72	19
73	18
74	10
75	11
76	18
77	13

n	a(n)
1	0
2	2
3	2
4	0
5	3
6	3
7	3
8	5
9	0
10	4
11	4
12	6
13	6
14	4
15	4
16	0
17	7
18	7
19	6
20	8
21	7
22	6
23	5
24	8
25	0
26	6
27	8
28	10
29	9
30	6
31	7
32	11
33	10
34	8
35	6
36	0
37	11
38	7
39	7
40	12
41	12
42	7
43	9
44	11
45	13
46	8
47	7
48	13
49	0
50	10
51	9
52	16
53	12
54	12
55	9
56	12
57	14
58	10
59	9
60	12
61	15
62	8
63	11
64	0
65	15
66	10
67	11
68	16
69	13
70	11
71	9
72	19
73	18
74	10
75	11
76	18
77	13

n	a(n)
1	0
2	2
3	2
4	0
5	3
6	3
7	3
8	5
9	0
10	4
11	4
12	6
13	6
14	4
15	4
16	0
17	7
18	7
19	6
20	8
21	7
22	6
23	5
24	8
25	0
26	6
27	8
28	10
29	9
30	6
31	7
32	11
33	10
34	8
35	6
36	0
37	11
38	7
39	7
40	12
41	12
42	7
43	9
44	11
45	13
46	8
47	7
48	13
49	0
50	10
51	9
52	16
53	12
54	12
55	9
56	12
57	14
58	10
59	9
60	12
61	15
62	8
63	11
64	0
65	15
66	10
67	11
68	16
69	13
70	11
71	9
72	19
73	18
74	10
75	11
76	18
77	13