A237597 - cp's OEIS frontend

A237597 a(n) = |{0 < k < prime(n): n divides pi(k*n)}|, where pi(.) is given by A000720.

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

[1, 1, 1, 2, 2, 1, 1, 3, 4, 3, 3, 3, 2, 4, 3, 3, 5, 7, 1, 3, 3, 5, 2, 5, 4, 4, 5, 5, 3, 7, 3, 2, 3, 4, 8, 4, 2, 6, 4, 5, 6, 8, 7, 2, 8, 2, 7, 1, 3, 6, 4, 6, 5, 1, 7, 4, 4, 3, 5, 6, 4, 8, 6, 5, 2, 5, 8, 4, 2, 5, 7, 5, 3, 1, 3, 2, 6, 3, 2, 4]

cp's OEIS Frontend

A237597 a(n) = |{0 < k < prime(n): n divides pi(k*n)}|, where pi(.) is given by A000720.

Table of values

List of values

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

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

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