A368744 - cp's OEIS frontend

A368744 a(n) = Sum_{d|n} (-1)^(d+1)*phi(d), where phi(n) = A000010(n).

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

[1, 0, 3, -2, 5, 0, 7, -6, 9, 0, 11, -6, 13, 0, 15, -14, 17, 0, 19, -10, 21, 0, 23, -18, 25, 0, 27, -14, 29, 0, 31, -30, 33, 0, 35, -18, 37, 0, 39, -30, 41, 0, 43, -22, 45, 0, 47, -42, 49, 0, 51, -26, 53, 0, 55, -42, 57, 0, 59, -30, 61, 0, 63, -62, 65, 0, 67, -34, 69, 0, 71, -54, 73, 0, 75]

cp's OEIS Frontend

A368744 a(n) = Sum_{d|n} (-1)^(d+1)*phi(d), where phi(n) = A000010(n).

Table of values

List of values

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

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

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