A205387 - cp's OEIS frontend

A205387 The index j such that n divides s(k)-s(j) for some j, where s(j)=(1/2)C(2j,j).

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	5
7	2
8	2
9	1
10	5
11	6
12	5
13	4
14	5
15	5
16	2
17	1
18	3
19	6
20	4
21	5
22	6
23	3
24	5
25	3
26	7
27	2
28	5
29	3
30	5
31	10
32	2
33	6
34	1
35	1
36	3
37	1
38	6
39	7
40	4
41	2
42	5
43	14
44	6
45	3
46	3
47	5
48	5
49	1
50	4

[1, 1, 1, 2, 3, 5, 2, 2, 1, 5, 6, 5, 4, 5, 5, 2, 1, 3, 6, 4, 5, 6, 3, 5, 3, 7, 2, 5, 3, 5, 10, 2, 6, 1, 1, 3, 1, 6, 7, 4, 2, 5, 14, 6, 3, 3, 5, 5, 1, 4]

cp's OEIS Frontend

A205387 The index j such that n divides s(k)-s(j) for some j, where s(j)=(1/2)C(2j,j).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	5
7	2
8	2
9	1
10	5
11	6
12	5
13	4
14	5
15	5
16	2
17	1
18	3
19	6
20	4
21	5
22	6
23	3
24	5
25	3
26	7
27	2
28	5
29	3
30	5
31	10
32	2
33	6
34	1
35	1
36	3
37	1
38	6
39	7
40	4
41	2
42	5
43	14
44	6
45	3
46	3
47	5
48	5
49	1
50	4

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	5
7	2
8	2
9	1
10	5
11	6
12	5
13	4
14	5
15	5
16	2
17	1
18	3
19	6
20	4
21	5
22	6
23	3
24	5
25	3
26	7
27	2
28	5
29	3
30	5
31	10
32	2
33	6
34	1
35	1
36	3
37	1
38	6
39	7
40	4
41	2
42	5
43	14
44	6
45	3
46	3
47	5
48	5
49	1
50	4

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	5
7	2
8	2
9	1
10	5
11	6
12	5
13	4
14	5
15	5
16	2
17	1
18	3
19	6
20	4
21	5
22	6
23	3
24	5
25	3
26	7
27	2
28	5
29	3
30	5
31	10
32	2
33	6
34	1
35	1
36	3
37	1
38	6
39	7
40	4
41	2
42	5
43	14
44	6
45	3
46	3
47	5
48	5
49	1
50	4