A383954 - cp's OEIS frontend

A383954 a(n) = Product_{i} (phi(p_i^e_i)-1) where n = Product_{i} p_i^e_i and phi is the Euler phi function.

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	3
9	5
10	0
11	9
12	1
13	11
14	0
15	3
16	7
17	15
18	0
19	17
20	3
21	5
22	0
23	21
24	3
25	19
26	0
27	17
28	5
29	27
30	0
31	29
32	15
33	9
34	0
35	15
36	5
37	35
38	0
39	11
40	9
41	39
42	0
43	41
44	9
45	15
46	0
47	45
48	7
49	41
50	0
51	15
52	11
53	51
54	0
55	27
56	15
57	17
58	0
59	57
60	3
61	59
62	0
63	25
64	31
65	33
66	0
67	65
68	15
69	21
70	0
71	69
72	15
73	71
74	0
75	19
76	17
77	45
78	0
79	77
80	21

[1, 0, 1, 1, 3, 0, 5, 3, 5, 0, 9, 1, 11, 0, 3, 7, 15, 0, 17, 3, 5, 0, 21, 3, 19, 0, 17, 5, 27, 0, 29, 15, 9, 0, 15, 5, 35, 0, 11, 9, 39, 0, 41, 9, 15, 0, 45, 7, 41, 0, 15, 11, 51, 0, 27, 15, 17, 0, 57, 3, 59, 0, 25, 31, 33, 0, 65, 15, 21, 0, 69, 15, 71, 0, 19, 17, 45, 0, 77, 21]

cp's OEIS Frontend

A383954 a(n) = Product_{i} (phi(p_i^e_i)-1) where n = Product_{i} p_i^e_i and phi is the Euler phi function.

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	3
9	5
10	0
11	9
12	1
13	11
14	0
15	3
16	7
17	15
18	0
19	17
20	3
21	5
22	0
23	21
24	3
25	19
26	0
27	17
28	5
29	27
30	0
31	29
32	15
33	9
34	0
35	15
36	5
37	35
38	0
39	11
40	9
41	39
42	0
43	41
44	9
45	15
46	0
47	45
48	7
49	41
50	0
51	15
52	11
53	51
54	0
55	27
56	15
57	17
58	0
59	57
60	3
61	59
62	0
63	25
64	31
65	33
66	0
67	65
68	15
69	21
70	0
71	69
72	15
73	71
74	0
75	19
76	17
77	45
78	0
79	77
80	21

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	3
9	5
10	0
11	9
12	1
13	11
14	0
15	3
16	7
17	15
18	0
19	17
20	3
21	5
22	0
23	21
24	3
25	19
26	0
27	17
28	5
29	27
30	0
31	29
32	15
33	9
34	0
35	15
36	5
37	35
38	0
39	11
40	9
41	39
42	0
43	41
44	9
45	15
46	0
47	45
48	7
49	41
50	0
51	15
52	11
53	51
54	0
55	27
56	15
57	17
58	0
59	57
60	3
61	59
62	0
63	25
64	31
65	33
66	0
67	65
68	15
69	21
70	0
71	69
72	15
73	71
74	0
75	19
76	17
77	45
78	0
79	77
80	21

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	3
9	5
10	0
11	9
12	1
13	11
14	0
15	3
16	7
17	15
18	0
19	17
20	3
21	5
22	0
23	21
24	3
25	19
26	0
27	17
28	5
29	27
30	0
31	29
32	15
33	9
34	0
35	15
36	5
37	35
38	0
39	11
40	9
41	39
42	0
43	41
44	9
45	15
46	0
47	45
48	7
49	41
50	0
51	15
52	11
53	51
54	0
55	27
56	15
57	17
58	0
59	57
60	3
61	59
62	0
63	25
64	31
65	33
66	0
67	65
68	15
69	21
70	0
71	69
72	15
73	71
74	0
75	19
76	17
77	45
78	0
79	77
80	21