A143422 - cp's OEIS frontend

A143422 Number of even numbers k such that phi(k) = n, where n runs through the values (A002202) taken by phi.

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

[1, 2, 3, 2, 4, 1, 4, 5, 2, 3, 1, 7, 1, 1, 6, 5, 6, 2, 2, 1, 9, 1, 1, 2, 1, 5, 7, 1, 1, 11, 1, 8, 1, 4, 4, 2, 13, 2, 1, 2, 1, 5, 1, 4, 2, 11, 1, 8, 1, 4, 1, 1, 2, 16, 1, 1, 4, 10, 2, 2, 1, 8, 1, 6, 1, 5, 3, 1, 17, 1, 1, 5, 2, 3, 1, 2, 12, 3, 1, 6, 1, 1, 4, 1, 21, 1, 5, 9, 2, 1, 7, 1, 1, 3, 5, 5, 1]

cp's OEIS Frontend

A143422 Number of even numbers k such that phi(k) = n, where n runs through the values (A002202) taken by phi.

Table of values

List of values

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

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

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