A282601 - cp's OEIS frontend

A282601 a(n) = Sum_(k=1..phi(n)/2) floor(d_k/2) where d_k are the totatives of n.

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	1
9	3
10	1
11	6
12	2
13	9
14	3
15	6
16	6
17	16
18	5
19	20
20	8
21	14
22	10
23	30
24	10
25	29
26	15
27	28
28	18
29	49
30	14
31	56
32	28
33	38
34	28
35	48
36	24
37	81
38	36
39	54
40	36
41	100
42	30
43	110
44	50
45	64
46	55
47	132
48	44
49	124
50	57
51	96
52	72
53	169
54	56
55	130
56	78
57	122
58	91
59	210
60	56
61	225
62	105
63	136
64	120
65	186
66	80
67	272
68	128
69	182
70	102

[0, 0, 0, 0, 1, 0, 2, 1, 3, 1, 6, 2, 9, 3, 6, 6, 16, 5, 20, 8, 14, 10, 30, 10, 29, 15, 28, 18, 49, 14, 56, 28, 38, 28, 48, 24, 81, 36, 54, 36, 100, 30, 110, 50, 64, 55, 132, 44, 124, 57, 96, 72, 169, 56, 130, 78, 122, 91, 210, 56, 225, 105, 136, 120, 186, 80, 272, 128, 182, 102]

cp's OEIS Frontend

A282601 a(n) = Sum_(k=1..phi(n)/2) floor(d_k/2) where d_k are the totatives of n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	1
9	3
10	1
11	6
12	2
13	9
14	3
15	6
16	6
17	16
18	5
19	20
20	8
21	14
22	10
23	30
24	10
25	29
26	15
27	28
28	18
29	49
30	14
31	56
32	28
33	38
34	28
35	48
36	24
37	81
38	36
39	54
40	36
41	100
42	30
43	110
44	50
45	64
46	55
47	132
48	44
49	124
50	57
51	96
52	72
53	169
54	56
55	130
56	78
57	122
58	91
59	210
60	56
61	225
62	105
63	136
64	120
65	186
66	80
67	272
68	128
69	182
70	102

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	1
9	3
10	1
11	6
12	2
13	9
14	3
15	6
16	6
17	16
18	5
19	20
20	8
21	14
22	10
23	30
24	10
25	29
26	15
27	28
28	18
29	49
30	14
31	56
32	28
33	38
34	28
35	48
36	24
37	81
38	36
39	54
40	36
41	100
42	30
43	110
44	50
45	64
46	55
47	132
48	44
49	124
50	57
51	96
52	72
53	169
54	56
55	130
56	78
57	122
58	91
59	210
60	56
61	225
62	105
63	136
64	120
65	186
66	80
67	272
68	128
69	182
70	102

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	1
9	3
10	1
11	6
12	2
13	9
14	3
15	6
16	6
17	16
18	5
19	20
20	8
21	14
22	10
23	30
24	10
25	29
26	15
27	28
28	18
29	49
30	14
31	56
32	28
33	38
34	28
35	48
36	24
37	81
38	36
39	54
40	36
41	100
42	30
43	110
44	50
45	64
46	55
47	132
48	44
49	124
50	57
51	96
52	72
53	169
54	56
55	130
56	78
57	122
58	91
59	210
60	56
61	225
62	105
63	136
64	120
65	186
66	80
67	272
68	128
69	182
70	102