A178109 - cp's OEIS frontend

A178109 The maximum number d, 2 <= d <= n/2, which divides binomial(n-d-1,d-1) and is not coprime to n.

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

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 6, 0, 6, 0, 0, 0, 4, 0, 0, 0, 8, 6, 10, 0, 8, 0, 14, 0, 14, 0, 15, 0, 14, 9, 14, 0, 9, 0, 10, 15, 20, 0, 22, 0, 22, 21, 18, 0, 21, 20, 22, 24, 24, 0, 26, 0, 28, 24, 30, 10, 28, 0, 30, 24, 26, 0, 33, 0, 30, 20, 30, 21, 28, 0, 38, 33, 38, 0, 28, 20, 36]

cp's OEIS Frontend

A178109 The maximum number d, 2 <= d <= n/2, which divides binomial(n-d-1,d-1) and is not coprime to n.

Table of values

List of values

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

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

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