A262945 - cp's OEIS frontend

A262945 Number of ordered pairs (x,y) with x >= 0 and y >= 0 such that n - x^4 - 2*y^2 is a triangular number or a pentagonal number.

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

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

cp's OEIS Frontend

A262945 Number of ordered pairs (x,y) with x >= 0 and y >= 0 such that n - x^4 - 2*y^2 is a triangular number or a pentagonal number.

Table of values

List of values

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

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

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