A206824 - cp's OEIS frontend

A206824 Number of solutions (n,k) of s(k) = s(n) (mod n), where 1 <= k < n and s(k) = k(k+1)/2.

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

[1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 3, 1, 1, 2, 1, 2, 3, 2, 1, 2, 1, 2, 1, 2, 1, 4, 1, 1, 3, 2, 3, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 2, 1, 2, 1, 2, 3, 2, 1, 2, 3, 2, 3, 2, 1, 4, 1, 2, 3, 1, 3, 4, 1, 2, 3, 4, 1, 2, 1, 2, 3, 2, 3, 4, 1, 2, 1, 2, 1, 4, 3, 2, 3, 2, 1, 4, 3, 2, 3, 2, 3, 2, 1, 2, 3, 2]

cp's OEIS Frontend

A206824 Number of solutions (n,k) of s(k) = s(n) (mod n), where 1 <= k < n and s(k) = k(k+1)/2.

Table of values

List of values

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

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

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