A281975 - cp's OEIS frontend

A281975 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 both x and |x-y| are squares.

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

[1, 3, 4, 3, 2, 4, 4, 2, 1, 4, 5, 3, 1, 2, 3, 2, 3, 5, 7, 3, 4, 5, 2, 1, 2, 6, 9, 6, 2, 4, 6, 3, 4, 6, 8, 4, 6, 5, 4, 3, 2, 11, 10, 4, 1, 7, 5, 1, 3, 3, 11, 9, 7, 5, 6, 4, 2, 7, 5, 4, 2, 6, 4, 3, 2, 7, 15, 4, 4, 6, 5, 1, 2, 6, 7, 7, 3, 6, 4, 2, 4]

cp's OEIS Frontend

A281975 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 both x and |x-y| are squares.

Table of values

List of values

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

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

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