A376404 - cp's OEIS frontend

A376404 Dirichlet inverse of 2*phi(n) - phi(A003961(n)), where phi is Euler totient function and A003961(n) is fully multiplicative function with a(prime(i)) = prime(i+1).

n	a(n)
1	1
2	0
3	0
4	2
5	-2
6	4
7	-2
8	10
9	8
10	4
11	-8
12	16
13	-8
14	8
15	8
16	42
17	-14
18	28
19	-14
20	12
21	16
22	4
23	-16
24	72
25	6
26	8
27	64
28	28
29	-26
30	16
31	-24
32	170
33	8
34	4
35	20
36	144
37	-32
38	8
39	16
40	52
41	-38
42	40
43	-38
44	0
45	40
46	12
47	-40
48	328
49	30
50	28
51	8
52	16
53	-46
54	228
55	24
56	124
57	16
58	4
59	-56
60	112
61	-54
62	12
63	96
64	682
65	32
66	-8
67	-62
68	-12
69	24
70	24
71	-68
72	712
73	-66
74	8
75	56
76	4
77	32
78	16

[1, 0, 0, 2, -2, 4, -2, 10, 8, 4, -8, 16, -8, 8, 8, 42, -14, 28, -14, 12, 16, 4, -16, 72, 6, 8, 64, 28, -26, 16, -24, 170, 8, 4, 20, 144, -32, 8, 16, 52, -38, 40, -38, 0, 40, 12, -40, 328, 30, 28, 8, 16, -46, 228, 24, 124, 16, 4, -56, 112, -54, 12, 96, 682, 32, -8, -62, -12, 24, 24, -68, 712, -66, 8, 56, 4, 32, 16]

cp's OEIS Frontend

A376404 Dirichlet inverse of 2*phi(n) - phi(A003961(n)), where phi is Euler totient function and A003961(n) is fully multiplicative function with a(prime(i)) = prime(i+1).

Table of values

List of values

n	a(n)
1	1
2	0
3	0
4	2
5	-2
6	4
7	-2
8	10
9	8
10	4
11	-8
12	16
13	-8
14	8
15	8
16	42
17	-14
18	28
19	-14
20	12
21	16
22	4
23	-16
24	72
25	6
26	8
27	64
28	28
29	-26
30	16
31	-24
32	170
33	8
34	4
35	20
36	144
37	-32
38	8
39	16
40	52
41	-38
42	40
43	-38
44	0
45	40
46	12
47	-40
48	328
49	30
50	28
51	8
52	16
53	-46
54	228
55	24
56	124
57	16
58	4
59	-56
60	112
61	-54
62	12
63	96
64	682
65	32
66	-8
67	-62
68	-12
69	24
70	24
71	-68
72	712
73	-66
74	8
75	56
76	4
77	32
78	16

n	a(n)
1	1
2	0
3	0
4	2
5	-2
6	4
7	-2
8	10
9	8
10	4
11	-8
12	16
13	-8
14	8
15	8
16	42
17	-14
18	28
19	-14
20	12
21	16
22	4
23	-16
24	72
25	6
26	8
27	64
28	28
29	-26
30	16
31	-24
32	170
33	8
34	4
35	20
36	144
37	-32
38	8
39	16
40	52
41	-38
42	40
43	-38
44	0
45	40
46	12
47	-40
48	328
49	30
50	28
51	8
52	16
53	-46
54	228
55	24
56	124
57	16
58	4
59	-56
60	112
61	-54
62	12
63	96
64	682
65	32
66	-8
67	-62
68	-12
69	24
70	24
71	-68
72	712
73	-66
74	8
75	56
76	4
77	32
78	16

n	a(n)
1	1
2	0
3	0
4	2
5	-2
6	4
7	-2
8	10
9	8
10	4
11	-8
12	16
13	-8
14	8
15	8
16	42
17	-14
18	28
19	-14
20	12
21	16
22	4
23	-16
24	72
25	6
26	8
27	64
28	28
29	-26
30	16
31	-24
32	170
33	8
34	4
35	20
36	144
37	-32
38	8
39	16
40	52
41	-38
42	40
43	-38
44	0
45	40
46	12
47	-40
48	328
49	30
50	28
51	8
52	16
53	-46
54	228
55	24
56	124
57	16
58	4
59	-56
60	112
61	-54
62	12
63	96
64	682
65	32
66	-8
67	-62
68	-12
69	24
70	24
71	-68
72	712
73	-66
74	8
75	56
76	4
77	32
78	16