A300708 - cp's OEIS frontend

A300708 Number of ways to write n as x^2 + y^2 + z^2 + w^2 with x,y,z,w nonnegative integers and z <= w such that x or y is a square and x - y is also a square.

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

[1, 2, 3, 2, 2, 3, 3, 2, 1, 3, 4, 2, 1, 2, 2, 2, 2, 3, 5, 2, 3, 3, 2, 1, 1, 5, 6, 5, 2, 3, 5, 3, 3, 4, 7, 3, 5, 4, 3, 3, 2, 8, 8, 4, 1, 6, 4, 1, 2, 3, 9, 7, 6, 3, 5, 4, 1, 6, 5, 3, 2, 5, 3, 3, 2, 5, 11, 4, 3, 4, 5, 1, 2, 5, 5, 6, 3, 5, 4, 2, 3]

cp's OEIS Frontend

A300708 Number of ways to write n as x^2 + y^2 + z^2 + w^2 with x,y,z,w nonnegative integers and z <= w such that x or y is a square and x - y is also a square.

Table of values

List of values

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

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

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