A069949 - cp's OEIS frontend

A069949 a(n) = Sum_{d|n} phi(d+1).

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	11
7	5
8	13
9	7
10	15
11	5
12	27
13	7
14	15
15	13
16	29
17	7
18	33
19	9
20	31
21	17
22	29
23	9
24	53
25	15
26	27
27	19
28	47
29	9
30	61
31	17
32	49
33	23
34	33
35	19
36	85
37	19
38	35
39	25
40	77
41	13
42	75
43	21
44	57
45	39
46	57
47	17
48	111
49	25
50	59
51	33
52	83
53	19
54	85
55	31
56	89
57	39
58	69
59	17
60	149
61	31
62	55
63	53
64	97
65	29
66	119
67	33
68	81
69	35
70	109
71	25
72	183

[1, 3, 3, 7, 3, 11, 5, 13, 7, 15, 5, 27, 7, 15, 13, 29, 7, 33, 9, 31, 17, 29, 9, 53, 15, 27, 19, 47, 9, 61, 17, 49, 23, 33, 19, 85, 19, 35, 25, 77, 13, 75, 21, 57, 39, 57, 17, 111, 25, 59, 33, 83, 19, 85, 31, 89, 39, 69, 17, 149, 31, 55, 53, 97, 29, 119, 33, 81, 35, 109, 25, 183]

cp's OEIS Frontend

A069949 a(n) = Sum_{d|n} phi(d+1).

Table of values

List of values

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	11
7	5
8	13
9	7
10	15
11	5
12	27
13	7
14	15
15	13
16	29
17	7
18	33
19	9
20	31
21	17
22	29
23	9
24	53
25	15
26	27
27	19
28	47
29	9
30	61
31	17
32	49
33	23
34	33
35	19
36	85
37	19
38	35
39	25
40	77
41	13
42	75
43	21
44	57
45	39
46	57
47	17
48	111
49	25
50	59
51	33
52	83
53	19
54	85
55	31
56	89
57	39
58	69
59	17
60	149
61	31
62	55
63	53
64	97
65	29
66	119
67	33
68	81
69	35
70	109
71	25
72	183

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	11
7	5
8	13
9	7
10	15
11	5
12	27
13	7
14	15
15	13
16	29
17	7
18	33
19	9
20	31
21	17
22	29
23	9
24	53
25	15
26	27
27	19
28	47
29	9
30	61
31	17
32	49
33	23
34	33
35	19
36	85
37	19
38	35
39	25
40	77
41	13
42	75
43	21
44	57
45	39
46	57
47	17
48	111
49	25
50	59
51	33
52	83
53	19
54	85
55	31
56	89
57	39
58	69
59	17
60	149
61	31
62	55
63	53
64	97
65	29
66	119
67	33
68	81
69	35
70	109
71	25
72	183

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	11
7	5
8	13
9	7
10	15
11	5
12	27
13	7
14	15
15	13
16	29
17	7
18	33
19	9
20	31
21	17
22	29
23	9
24	53
25	15
26	27
27	19
28	47
29	9
30	61
31	17
32	49
33	23
34	33
35	19
36	85
37	19
38	35
39	25
40	77
41	13
42	75
43	21
44	57
45	39
46	57
47	17
48	111
49	25
50	59
51	33
52	83
53	19
54	85
55	31
56	89
57	39
58	69
59	17
60	149
61	31
62	55
63	53
64	97
65	29
66	119
67	33
68	81
69	35
70	109
71	25
72	183