A004531 - cp's OEIS frontend

A004531 Number of integer solutions to x^2 + 4 * y^2 = n.

n	a(n)
0	1
1	2
2	0
3	0
4	4
5	4
6	0
7	0
8	4
9	2
10	0
11	0
12	0
13	4
14	0
15	0
16	4
17	4
18	0
19	0
20	8
21	0
22	0
23	0
24	0
25	6
26	0
27	0
28	0
29	4
30	0
31	0
32	4
33	0
34	0
35	0
36	4
37	4
38	0
39	0
40	8
41	4
42	0
43	0
44	0
45	4
46	0
47	0
48	0
49	2
50	0
51	0
52	8
53	4
54	0
55	0
56	0
57	0
58	0
59	0
60	0
61	4
62	0
63	0
64	4
65	8
66	0
67	0
68	8
69	0
70	0
71	0
72	4
73	4
74	0
75	0
76	0
77	0
78	0
79	0
80	8
81	2
82	0
83	0
84	0
85	8
86	0
87	0
88	0
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	0
97	4
98	0
99	0
100	12
101	4
102	0
103	0
104	8

[1, 2, 0, 0, 4, 4, 0, 0, 4, 2, 0, 0, 0, 4, 0, 0, 4, 4, 0, 0, 8, 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 4, 0, 0, 0, 4, 4, 0, 0, 8, 4, 0, 0, 0, 4, 0, 0, 0, 2, 0, 0, 8, 4, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 4, 8, 0, 0, 8, 0, 0, 0, 4, 4, 0, 0, 0, 0, 0, 0, 8, 2, 0, 0, 0, 8, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 12, 4, 0, 0, 8]

cp's OEIS Frontend

A004531 Number of integer solutions to x^2 + 4 * y^2 = n.

Table of values

List of values

n	a(n)
0	1
1	2
2	0
3	0
4	4
5	4
6	0
7	0
8	4
9	2
10	0
11	0
12	0
13	4
14	0
15	0
16	4
17	4
18	0
19	0
20	8
21	0
22	0
23	0
24	0
25	6
26	0
27	0
28	0
29	4
30	0
31	0
32	4
33	0
34	0
35	0
36	4
37	4
38	0
39	0
40	8
41	4
42	0
43	0
44	0
45	4
46	0
47	0
48	0
49	2
50	0
51	0
52	8
53	4
54	0
55	0
56	0
57	0
58	0
59	0
60	0
61	4
62	0
63	0
64	4
65	8
66	0
67	0
68	8
69	0
70	0
71	0
72	4
73	4
74	0
75	0
76	0
77	0
78	0
79	0
80	8
81	2
82	0
83	0
84	0
85	8
86	0
87	0
88	0
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	0
97	4
98	0
99	0
100	12
101	4
102	0
103	0
104	8

n	a(n)
0	1
1	2
2	0
3	0
4	4
5	4
6	0
7	0
8	4
9	2
10	0
11	0
12	0
13	4
14	0
15	0
16	4
17	4
18	0
19	0
20	8
21	0
22	0
23	0
24	0
25	6
26	0
27	0
28	0
29	4
30	0
31	0
32	4
33	0
34	0
35	0
36	4
37	4
38	0
39	0
40	8
41	4
42	0
43	0
44	0
45	4
46	0
47	0
48	0
49	2
50	0
51	0
52	8
53	4
54	0
55	0
56	0
57	0
58	0
59	0
60	0
61	4
62	0
63	0
64	4
65	8
66	0
67	0
68	8
69	0
70	0
71	0
72	4
73	4
74	0
75	0
76	0
77	0
78	0
79	0
80	8
81	2
82	0
83	0
84	0
85	8
86	0
87	0
88	0
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	0
97	4
98	0
99	0
100	12
101	4
102	0
103	0
104	8

n	a(n)
0	1
1	2
2	0
3	0
4	4
5	4
6	0
7	0
8	4
9	2
10	0
11	0
12	0
13	4
14	0
15	0
16	4
17	4
18	0
19	0
20	8
21	0
22	0
23	0
24	0
25	6
26	0
27	0
28	0
29	4
30	0
31	0
32	4
33	0
34	0
35	0
36	4
37	4
38	0
39	0
40	8
41	4
42	0
43	0
44	0
45	4
46	0
47	0
48	0
49	2
50	0
51	0
52	8
53	4
54	0
55	0
56	0
57	0
58	0
59	0
60	0
61	4
62	0
63	0
64	4
65	8
66	0
67	0
68	8
69	0
70	0
71	0
72	4
73	4
74	0
75	0
76	0
77	0
78	0
79	0
80	8
81	2
82	0
83	0
84	0
85	8
86	0
87	0
88	0
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	0
97	4
98	0
99	0
100	12
101	4
102	0
103	0
104	8