A115878 - cp's OEIS frontend

A115878 a(n) is the number of positive solutions of the Diophantine equation x^2 = y(y+n).

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	1
14	1
15	4
16	2
17	1
18	2
19	1
20	1
21	4
22	1
23	1
24	4
25	2
26	1
27	3
28	1
29	1
30	4
31	1
32	3
33	4
34	1
35	4
36	2
37	1
38	1
39	4
40	4
41	1
42	4
43	1
44	1
45	7
46	1
47	1
48	7
49	2
50	2
51	4
52	1
53	1
54	3
55	4
56	4
57	4
58	1
59	1
60	4
61	1
62	1
63	7
64	4
65	4
66	4
67	1
68	1
69	4
70	4
71	1
72	7
73	1
74	1
75	7
76	1
77	4
78	4
79	1
80	7
81	4
82	1
83	1
84	4
85	4
86	1
87	4
88	4
89	1
90	7
91	4
92	1
93	4
94	1
95	4
96	10
97	1
98	2
99	7
100	2
101	1
102	4

[0, 0, 1, 0, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 4, 2, 1, 2, 1, 1, 4, 1, 1, 4, 2, 1, 3, 1, 1, 4, 1, 3, 4, 1, 4, 2, 1, 1, 4, 4, 1, 4, 1, 1, 7, 1, 1, 7, 2, 2, 4, 1, 1, 3, 4, 4, 4, 1, 1, 4, 1, 1, 7, 4, 4, 4, 1, 1, 4, 4, 1, 7, 1, 1, 7, 1, 4, 4, 1, 7, 4, 1, 1, 4, 4, 1, 4, 4, 1, 7, 4, 1, 4, 1, 4, 10, 1, 2, 7, 2, 1, 4]

cp's OEIS Frontend

A115878 a(n) is the number of positive solutions of the Diophantine equation x^2 = y(y+n).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	1
14	1
15	4
16	2
17	1
18	2
19	1
20	1
21	4
22	1
23	1
24	4
25	2
26	1
27	3
28	1
29	1
30	4
31	1
32	3
33	4
34	1
35	4
36	2
37	1
38	1
39	4
40	4
41	1
42	4
43	1
44	1
45	7
46	1
47	1
48	7
49	2
50	2
51	4
52	1
53	1
54	3
55	4
56	4
57	4
58	1
59	1
60	4
61	1
62	1
63	7
64	4
65	4
66	4
67	1
68	1
69	4
70	4
71	1
72	7
73	1
74	1
75	7
76	1
77	4
78	4
79	1
80	7
81	4
82	1
83	1
84	4
85	4
86	1
87	4
88	4
89	1
90	7
91	4
92	1
93	4
94	1
95	4
96	10
97	1
98	2
99	7
100	2
101	1
102	4

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	1
14	1
15	4
16	2
17	1
18	2
19	1
20	1
21	4
22	1
23	1
24	4
25	2
26	1
27	3
28	1
29	1
30	4
31	1
32	3
33	4
34	1
35	4
36	2
37	1
38	1
39	4
40	4
41	1
42	4
43	1
44	1
45	7
46	1
47	1
48	7
49	2
50	2
51	4
52	1
53	1
54	3
55	4
56	4
57	4
58	1
59	1
60	4
61	1
62	1
63	7
64	4
65	4
66	4
67	1
68	1
69	4
70	4
71	1
72	7
73	1
74	1
75	7
76	1
77	4
78	4
79	1
80	7
81	4
82	1
83	1
84	4
85	4
86	1
87	4
88	4
89	1
90	7
91	4
92	1
93	4
94	1
95	4
96	10
97	1
98	2
99	7
100	2
101	1
102	4

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	1
8	1
9	2
10	1
11	1
12	1
13	1
14	1
15	4
16	2
17	1
18	2
19	1
20	1
21	4
22	1
23	1
24	4
25	2
26	1
27	3
28	1
29	1
30	4
31	1
32	3
33	4
34	1
35	4
36	2
37	1
38	1
39	4
40	4
41	1
42	4
43	1
44	1
45	7
46	1
47	1
48	7
49	2
50	2
51	4
52	1
53	1
54	3
55	4
56	4
57	4
58	1
59	1
60	4
61	1
62	1
63	7
64	4
65	4
66	4
67	1
68	1
69	4
70	4
71	1
72	7
73	1
74	1
75	7
76	1
77	4
78	4
79	1
80	7
81	4
82	1
83	1
84	4
85	4
86	1
87	4
88	4
89	1
90	7
91	4
92	1
93	4
94	1
95	4
96	10
97	1
98	2
99	7
100	2
101	1
102	4