A317993 - cp's OEIS frontend

A317993 Number of k such that (Z/kZ)* is isomorphic to (Z/nZ), where (Z/nZ) is the multiplicative group of integers modulo n.

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

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

cp's OEIS Frontend

A317993 Number of k such that (Z/kZ)* is isomorphic to (Z/nZ), where (Z/nZ) is the multiplicative group of integers modulo n.

Table of values

List of values

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

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

cp's OEIS Frontend

A317993 Number of k such that (Z/kZ)* is isomorphic to (Z/nZ)*, where (Z/nZ)* is the multiplicative group of integers modulo n.

Table of values

List of values

A317993 Number of k such that (Z/kZ)* is isomorphic to (Z/nZ), where (Z/nZ) is the multiplicative group of integers modulo n.

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