A178105 - cp's OEIS frontend

A178105 Let B_n be the set of divisors 2 <= d <= n/2 of binomial(n-d-1,d-1) such that gcd(n,d)>1. The sequence lists the minimal d of B_n, or a(n)=0 if B_n is empty.

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

[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, 6, 6, 10, 0, 4, 0, 6, 0, 6, 0, 14, 0, 4, 9, 6, 0, 8, 0, 8, 6, 4, 0, 10, 0, 6, 15, 12, 0, 4, 20, 6, 18, 6, 0, 18, 0, 4, 6, 6, 10, 9, 0, 14, 9, 4, 0, 6, 0, 6, 12, 8, 21, 4, 0, 6, 6, 6, 0, 16, 20, 4, 18, 6, 0, 6, 28, 10, 9, 4, 15, 9, 0, 6, 6, 14]

cp's OEIS Frontend

A178105 Let B_n be the set of divisors 2 <= d <= n/2 of binomial(n-d-1,d-1) such that gcd(n,d)>1. The sequence lists the minimal d of B_n, or a(n)=0 if B_n is empty.

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

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

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