A262955 - cp's OEIS frontend

A262955 Number of ordered pairs (x,y) with x >= 0 and y > 0 such that n - x^4 - y*(y+1)/2 is a pentagonal number (A000326) or twice a pentagonal number.

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

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

cp's OEIS Frontend

A262955 Number of ordered pairs (x,y) with x >= 0 and y > 0 such that n - x^4 - y*(y+1)/2 is a pentagonal number (A000326) or twice a pentagonal number.

Table of values

List of values

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

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

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