A230476 - cp's OEIS frontend

A230476 a(n) = Sum_{i=1..n} d(8i+1) - Sum_{i=1..n} d(2i+1), where d(n) = A000005(n) is the number of divisors of n.

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

[1, 1, 2, 3, 3, 4, 4, 6, 6, 7, 7, 6, 10, 10, 11, 11, 9, 11, 13, 15, 16, 14, 16, 15, 15, 17, 17, 22, 22, 22, 20, 18, 20, 24, 24, 25, 27, 27, 27, 26, 28, 26, 30, 30, 29, 31, 31, 37, 35, 35, 35, 31, 35, 35, 40, 40, 38, 40, 40, 41, 41, 41, 43, 47, 47, 46, 42, 44, 46, 50, 48, 46, 52, 52, 52, 54, 52, 55, 55, 53, 55, 53, 59, 58, 56, 58]

cp's OEIS Frontend

A230476 a(n) = Sum_{i=1..n} d(8i+1) - Sum_{i=1..n} d(2i+1), where d(n) = A000005(n) is the number of divisors of n.

Table of values

List of values

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

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

cp's OEIS Frontend

A230476 a(n) = Sum_{i=1..n} d(8*i+1) - Sum_{i=1..n} d(2*i+1), where d(n) = A000005(n) is the number of divisors of n.

Table of values

List of values

A230476 a(n) = Sum_{i=1..n} d(8i+1) - Sum_{i=1..n} d(2i+1), where d(n) = A000005(n) is the number of divisors of n.

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