A367175 - cp's OEIS frontend

A367175 a(n) = Sum_{d|n} (-1)^[d is prime] * d, where [] denotes the Iverson bracket.

n	a(n)
1	1
2	-1
3	-2
4	3
5	-4
6	2
7	-6
8	11
9	7
10	4
11	-10
12	18
13	-12
14	6
15	8
16	27
17	-16
18	29
19	-18
20	28
21	12
22	10
23	-22
24	50
25	21
26	12
27	34
28	38
29	-28
30	52
31	-30
32	59
33	20
34	16
35	24
36	81
37	-36
38	18
39	24
40	76
41	-40
42	72
43	-42
44	58
45	62
46	22
47	-46
48	114
49	43
50	79
51	32
52	68
53	-52
54	110
55	40
56	102
57	36
58	28
59	-58
60	148
61	-60
62	30

[1, -1, -2, 3, -4, 2, -6, 11, 7, 4, -10, 18, -12, 6, 8, 27, -16, 29, -18, 28, 12, 10, -22, 50, 21, 12, 34, 38, -28, 52, -30, 59, 20, 16, 24, 81, -36, 18, 24, 76, -40, 72, -42, 58, 62, 22, -46, 114, 43, 79, 32, 68, -52, 110, 40, 102, 36, 28, -58, 148, -60, 30]

cp's OEIS Frontend

A367175 a(n) = Sum_{d|n} (-1)^[d is prime] * d, where [] denotes the Iverson bracket.

Table of values

List of values

n	a(n)
1	1
2	-1
3	-2
4	3
5	-4
6	2
7	-6
8	11
9	7
10	4
11	-10
12	18
13	-12
14	6
15	8
16	27
17	-16
18	29
19	-18
20	28
21	12
22	10
23	-22
24	50
25	21
26	12
27	34
28	38
29	-28
30	52
31	-30
32	59
33	20
34	16
35	24
36	81
37	-36
38	18
39	24
40	76
41	-40
42	72
43	-42
44	58
45	62
46	22
47	-46
48	114
49	43
50	79
51	32
52	68
53	-52
54	110
55	40
56	102
57	36
58	28
59	-58
60	148
61	-60
62	30

n	a(n)
1	1
2	-1
3	-2
4	3
5	-4
6	2
7	-6
8	11
9	7
10	4
11	-10
12	18
13	-12
14	6
15	8
16	27
17	-16
18	29
19	-18
20	28
21	12
22	10
23	-22
24	50
25	21
26	12
27	34
28	38
29	-28
30	52
31	-30
32	59
33	20
34	16
35	24
36	81
37	-36
38	18
39	24
40	76
41	-40
42	72
43	-42
44	58
45	62
46	22
47	-46
48	114
49	43
50	79
51	32
52	68
53	-52
54	110
55	40
56	102
57	36
58	28
59	-58
60	148
61	-60
62	30

n	a(n)
1	1
2	-1
3	-2
4	3
5	-4
6	2
7	-6
8	11
9	7
10	4
11	-10
12	18
13	-12
14	6
15	8
16	27
17	-16
18	29
19	-18
20	28
21	12
22	10
23	-22
24	50
25	21
26	12
27	34
28	38
29	-28
30	52
31	-30
32	59
33	20
34	16
35	24
36	81
37	-36
38	18
39	24
40	76
41	-40
42	72
43	-42
44	58
45	62
46	22
47	-46
48	114
49	43
50	79
51	32
52	68
53	-52
54	110
55	40
56	102
57	36
58	28
59	-58
60	148
61	-60
62	30