A262941 - cp's OEIS frontend

A262941 Number of ordered pairs (x,y) with x >= 0 and y > 0 such that n - x^4 - y*(y+1)/2 is an even square or twice a square.

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

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

cp's OEIS Frontend

A262941 Number of ordered pairs (x,y) with x >= 0 and y > 0 such that n - x^4 - y*(y+1)/2 is an even square or twice a square.

Table of values

List of values

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

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

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