A080736 - cp's OEIS frontend

A080736 Multiplicative function defined by a(1)=1, a(2)=0, a(2^r) = phi(2^r) (r>1), a(p^r) = phi(p^r) (p odd prime, r>=1), where phi is Euler's function A000010.

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

[1, 0, 2, 2, 4, 0, 6, 4, 6, 0, 10, 4, 12, 0, 8, 8, 16, 0, 18, 8, 12, 0, 22, 8, 20, 0, 18, 12, 28, 0, 30, 16, 20, 0, 24, 12, 36, 0, 24, 16, 40, 0, 42, 20, 24, 0, 46, 16, 42, 0, 32, 24, 52, 0, 40, 24, 36, 0, 58, 16, 60, 0, 36, 32, 48, 0, 66, 32, 44, 0, 70, 24, 72, 0, 40, 36, 60, 0, 78, 32]

cp's OEIS Frontend

A080736 Multiplicative function defined by a(1)=1, a(2)=0, a(2^r) = phi(2^r) (r>1), a(p^r) = phi(p^r) (p odd prime, r>=1), where phi is Euler's function A000010.

Table of values

List of values

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

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

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