A081372 - cp's OEIS frontend

A081372 a(n) is the number of j from 1 to n such that binomial(n,j) is divisible by j.

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

[1, 1, 1, 2, 2, 1, 1, 2, 4, 3, 3, 3, 3, 1, 1, 3, 3, 5, 5, 4, 3, 1, 1, 2, 4, 2, 6, 7, 7, 2, 2, 8, 7, 6, 5, 6, 6, 4, 2, 4, 4, 2, 2, 2, 4, 2, 2, 4, 8, 12, 9, 8, 8, 12, 10, 12, 11, 8, 8, 6, 6, 3, 4, 14, 12, 9, 9, 9, 7, 4, 4, 7, 7, 6, 9, 11, 10, 4, 4, 6, 17, 15, 15, 11, 9, 6, 6, 9, 9, 6, 5, 6, 5, 2, 1, 4, 4, 9, 12]

cp's OEIS Frontend

A081372 a(n) is the number of j from 1 to n such that binomial(n,j) is divisible by j.

Table of values

List of values

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

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

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