A092843 - cp's OEIS frontend

A092843 a(n) = Sum_{k|n, k>1} phi(k-1), where phi() is the Euler phi function.

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	6
7	2
8	9
9	5
10	9
11	4
12	18
13	4
14	15
15	9
16	17
17	8
18	26
19	6
20	29
21	11
22	17
23	10
24	46
25	10
26	25
27	17
28	35
29	12
30	48
31	8
32	47
33	21
34	29
35	20
36	62
37	12
38	43
39	23
40	59
41	16
42	68
43	12
44	61
45	33
46	35
47	22
48	100
49	18
50	59
51	29
52	59
53	24
54	90
55	24
56	81
57	31
58	49
59	28
60	136
61	16
62	69
63	45
64	83
65	38
66	86
67	20
68	97
69	43
70	83
71	24
72	160
73	24
74	85

[0, 1, 1, 3, 2, 6, 2, 9, 5, 9, 4, 18, 4, 15, 9, 17, 8, 26, 6, 29, 11, 17, 10, 46, 10, 25, 17, 35, 12, 48, 8, 47, 21, 29, 20, 62, 12, 43, 23, 59, 16, 68, 12, 61, 33, 35, 22, 100, 18, 59, 29, 59, 24, 90, 24, 81, 31, 49, 28, 136, 16, 69, 45, 83, 38, 86, 20, 97, 43, 83, 24, 160, 24, 85]

cp's OEIS Frontend

A092843 a(n) = Sum_{k|n, k>1} phi(k-1), where phi() is the Euler phi function.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	6
7	2
8	9
9	5
10	9
11	4
12	18
13	4
14	15
15	9
16	17
17	8
18	26
19	6
20	29
21	11
22	17
23	10
24	46
25	10
26	25
27	17
28	35
29	12
30	48
31	8
32	47
33	21
34	29
35	20
36	62
37	12
38	43
39	23
40	59
41	16
42	68
43	12
44	61
45	33
46	35
47	22
48	100
49	18
50	59
51	29
52	59
53	24
54	90
55	24
56	81
57	31
58	49
59	28
60	136
61	16
62	69
63	45
64	83
65	38
66	86
67	20
68	97
69	43
70	83
71	24
72	160
73	24
74	85

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	6
7	2
8	9
9	5
10	9
11	4
12	18
13	4
14	15
15	9
16	17
17	8
18	26
19	6
20	29
21	11
22	17
23	10
24	46
25	10
26	25
27	17
28	35
29	12
30	48
31	8
32	47
33	21
34	29
35	20
36	62
37	12
38	43
39	23
40	59
41	16
42	68
43	12
44	61
45	33
46	35
47	22
48	100
49	18
50	59
51	29
52	59
53	24
54	90
55	24
56	81
57	31
58	49
59	28
60	136
61	16
62	69
63	45
64	83
65	38
66	86
67	20
68	97
69	43
70	83
71	24
72	160
73	24
74	85

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	6
7	2
8	9
9	5
10	9
11	4
12	18
13	4
14	15
15	9
16	17
17	8
18	26
19	6
20	29
21	11
22	17
23	10
24	46
25	10
26	25
27	17
28	35
29	12
30	48
31	8
32	47
33	21
34	29
35	20
36	62
37	12
38	43
39	23
40	59
41	16
42	68
43	12
44	61
45	33
46	35
47	22
48	100
49	18
50	59
51	29
52	59
53	24
54	90
55	24
56	81
57	31
58	49
59	28
60	136
61	16
62	69
63	45
64	83
65	38
66	86
67	20
68	97
69	43
70	83
71	24
72	160
73	24
74	85