A071640 - cp's OEIS frontend

A071640 a(n) = Sum_{i=1..n} A040051(i).

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

[1, 1, 2, 3, 4, 5, 6, 6, 6, 6, 6, 7, 8, 9, 9, 10, 11, 12, 12, 13, 13, 13, 14, 15, 15, 15, 15, 15, 16, 16, 16, 17, 18, 18, 19, 20, 21, 22, 23, 23, 24, 24, 25, 26, 26, 26, 26, 27, 28, 28, 29, 30, 31, 32, 32, 33, 33, 33, 33, 34, 35, 35, 36, 36, 36, 36, 37, 38, 39, 39, 40, 41, 42, 42]

cp's OEIS Frontend

A071640 a(n) = Sum_{i=1..n} A040051(i).

Table of values

List of values

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

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

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