A349909 - cp's OEIS frontend

A349909 Partial sums of A347870; Number of terms of A347877 (numbers k with an odd arithmetic derivative of sigma(k)) in range 1..n.

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	7
17	8
18	8
19	8
20	9
21	9
22	9
23	9
24	9
25	10
26	11
27	11
28	11
29	12
30	12
31	12
32	13
33	13
34	14
35	14
36	14
37	15
38	15
39	15
40	16
41	17
42	17
43	17
44	17
45	18
46	18
47	18
48	18
49	18
50	18
51	18
52	19
53	20
54	20
55	20
56	20
57	20
58	21
59	21
60	21
61	22
62	22
63	22
64	23
65	23
66	23
67	23
68	24
69	24
70	24
71	24
72	25
73	26
74	27
75	27
76	27
77	27
78	27
79	27
80	28
81	28
82	29
83	29
84	29
85	29

[0, 1, 1, 2, 3, 3, 3, 3, 4, 5, 5, 5, 6, 6, 6, 7, 8, 8, 8, 9, 9, 9, 9, 9, 10, 11, 11, 11, 12, 12, 12, 13, 13, 14, 14, 14, 15, 15, 15, 16, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 19, 20, 20, 20, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 26, 27, 27, 27, 27, 27, 27, 28, 28, 29, 29, 29, 29]

cp's OEIS Frontend

A349909 Partial sums of A347870; Number of terms of A347877 (numbers k with an odd arithmetic derivative of sigma(k)) in range 1..n.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	7
17	8
18	8
19	8
20	9
21	9
22	9
23	9
24	9
25	10
26	11
27	11
28	11
29	12
30	12
31	12
32	13
33	13
34	14
35	14
36	14
37	15
38	15
39	15
40	16
41	17
42	17
43	17
44	17
45	18
46	18
47	18
48	18
49	18
50	18
51	18
52	19
53	20
54	20
55	20
56	20
57	20
58	21
59	21
60	21
61	22
62	22
63	22
64	23
65	23
66	23
67	23
68	24
69	24
70	24
71	24
72	25
73	26
74	27
75	27
76	27
77	27
78	27
79	27
80	28
81	28
82	29
83	29
84	29
85	29

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	7
17	8
18	8
19	8
20	9
21	9
22	9
23	9
24	9
25	10
26	11
27	11
28	11
29	12
30	12
31	12
32	13
33	13
34	14
35	14
36	14
37	15
38	15
39	15
40	16
41	17
42	17
43	17
44	17
45	18
46	18
47	18
48	18
49	18
50	18
51	18
52	19
53	20
54	20
55	20
56	20
57	20
58	21
59	21
60	21
61	22
62	22
63	22
64	23
65	23
66	23
67	23
68	24
69	24
70	24
71	24
72	25
73	26
74	27
75	27
76	27
77	27
78	27
79	27
80	28
81	28
82	29
83	29
84	29
85	29

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	7
17	8
18	8
19	8
20	9
21	9
22	9
23	9
24	9
25	10
26	11
27	11
28	11
29	12
30	12
31	12
32	13
33	13
34	14
35	14
36	14
37	15
38	15
39	15
40	16
41	17
42	17
43	17
44	17
45	18
46	18
47	18
48	18
49	18
50	18
51	18
52	19
53	20
54	20
55	20
56	20
57	20
58	21
59	21
60	21
61	22
62	22
63	22
64	23
65	23
66	23
67	23
68	24
69	24
70	24
71	24
72	25
73	26
74	27
75	27
76	27
77	27
78	27
79	27
80	28
81	28
82	29
83	29
84	29
85	29