A217840 - cp's OEIS frontend

A217840 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 matters for the equation x^2 + y^2 = n.

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

[0, 2, 2, 0, 4, 3, 3, 5, 0, 5, 4, 6, 7, 4, 4, 0, 8, 7, 6, 9, 7, 6, 5, 8, 0, 7, 8, 10, 10, 6, 7, 11, 10, 9, 6, 0, 12, 7, 7, 13, 13, 7, 9, 11, 14, 8, 7, 13, 0, 11, 9, 17, 13, 12, 9, 12, 14, 11, 9, 12, 16, 8, 11, 0, 17, 10, 11, 17, 13, 11, 9, 19, 19, 11, 11, 18, 13, 9, 12, 18, 0, 13, 10, 18, 20, 11, 10, 18, 19, 15, 13, 15, 15, 12, 10, 18, 22, 12, 16, 0]

cp's OEIS Frontend

A217840 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 matters 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	4
6	3
7	3
8	5
9	0
10	5
11	4
12	6
13	7
14	4
15	4
16	0
17	8
18	7
19	6
20	9
21	7
22	6
23	5
24	8
25	0
26	7
27	8
28	10
29	10
30	6
31	7
32	11
33	10
34	9
35	6
36	0
37	12
38	7
39	7
40	13
41	13
42	7
43	9
44	11
45	14
46	8
47	7
48	13
49	0
50	11
51	9
52	17
53	13
54	12
55	9
56	12
57	14
58	11
59	9
60	12
61	16
62	8
63	11
64	0
65	17
66	10
67	11
68	17
69	13
70	11
71	9
72	19
73	19
74	11
75	11
76	18
77	13
78	9
79	12
80	18
81	0
82	13
83	10
84	18
85	20
86	11
87	10
88	18
89	19
90	15
91	13
92	15
93	15
94	12
95	10
96	18
97	22
98	12
99	16
100	0

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

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