A324213 - cp's OEIS frontend

A324213 Number of k with 0 <= k <= sigma(n) such that n-k and 2n-sigma(n) are relatively prime.

n	a(n)
1	2
2	4
3	3
4	8
5	4
6	2
7	4
8	16
9	12
10	9
11	6
12	14
13	6
14	12
15	8
16	32
17	10
18	26
19	8
20	21
21	14
22	18
23	12
24	20
25	30
26	16
27	18
28	2
29	14
30	24
31	10
32	64
33	16
34	24
35	22
36	88
37	14
38	30
39	26
40	36
41	18
42	32
43	14
44	42
45	26
46	28
47	24
48	54
49	56
50	80
51	20
52	32
53	26
54	40
55	36
56	60
57	38
58	42
59	30
60	56
61	18
62	42
63	48
64	128
65	42
66	48
67	22
68	50
69	28
70	72
71	26
72	122
73	26
74	54
75	58
76	46
77	48
78	56
79	26
80	86
81	120
82	60
83	42
84	96
85	54

[2, 4, 3, 8, 4, 2, 4, 16, 12, 9, 6, 14, 6, 12, 8, 32, 10, 26, 8, 21, 14, 18, 12, 20, 30, 16, 18, 2, 14, 24, 10, 64, 16, 24, 22, 88, 14, 30, 26, 36, 18, 32, 14, 42, 26, 28, 24, 54, 56, 80, 20, 32, 26, 40, 36, 60, 38, 42, 30, 56, 18, 42, 48, 128, 42, 48, 22, 50, 28, 72, 26, 122, 26, 54, 58, 46, 48, 56, 26, 86, 120, 60, 42, 96, 54]

cp's OEIS Frontend

A324213 Number of k with 0 <= k <= sigma(n) such that n-k and 2n-sigma(n) are relatively prime.

Table of values

List of values

n	a(n)
1	2
2	4
3	3
4	8
5	4
6	2
7	4
8	16
9	12
10	9
11	6
12	14
13	6
14	12
15	8
16	32
17	10
18	26
19	8
20	21
21	14
22	18
23	12
24	20
25	30
26	16
27	18
28	2
29	14
30	24
31	10
32	64
33	16
34	24
35	22
36	88
37	14
38	30
39	26
40	36
41	18
42	32
43	14
44	42
45	26
46	28
47	24
48	54
49	56
50	80
51	20
52	32
53	26
54	40
55	36
56	60
57	38
58	42
59	30
60	56
61	18
62	42
63	48
64	128
65	42
66	48
67	22
68	50
69	28
70	72
71	26
72	122
73	26
74	54
75	58
76	46
77	48
78	56
79	26
80	86
81	120
82	60
83	42
84	96
85	54

n	a(n)
1	2
2	4
3	3
4	8
5	4
6	2
7	4
8	16
9	12
10	9
11	6
12	14
13	6
14	12
15	8
16	32
17	10
18	26
19	8
20	21
21	14
22	18
23	12
24	20
25	30
26	16
27	18
28	2
29	14
30	24
31	10
32	64
33	16
34	24
35	22
36	88
37	14
38	30
39	26
40	36
41	18
42	32
43	14
44	42
45	26
46	28
47	24
48	54
49	56
50	80
51	20
52	32
53	26
54	40
55	36
56	60
57	38
58	42
59	30
60	56
61	18
62	42
63	48
64	128
65	42
66	48
67	22
68	50
69	28
70	72
71	26
72	122
73	26
74	54
75	58
76	46
77	48
78	56
79	26
80	86
81	120
82	60
83	42
84	96
85	54

n	a(n)
1	2
2	4
3	3
4	8
5	4
6	2
7	4
8	16
9	12
10	9
11	6
12	14
13	6
14	12
15	8
16	32
17	10
18	26
19	8
20	21
21	14
22	18
23	12
24	20
25	30
26	16
27	18
28	2
29	14
30	24
31	10
32	64
33	16
34	24
35	22
36	88
37	14
38	30
39	26
40	36
41	18
42	32
43	14
44	42
45	26
46	28
47	24
48	54
49	56
50	80
51	20
52	32
53	26
54	40
55	36
56	60
57	38
58	42
59	30
60	56
61	18
62	42
63	48
64	128
65	42
66	48
67	22
68	50
69	28
70	72
71	26
72	122
73	26
74	54
75	58
76	46
77	48
78	56
79	26
80	86
81	120
82	60
83	42
84	96
85	54