A013937 - cp's OEIS frontend

A013937 a(n) = Sum_{k=1..n} floor(n/k^3).

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

[0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 75, 76, 77, 78, 79, 80, 81, 82]

cp's OEIS Frontend

A013937 a(n) = Sum_{k=1..n} floor(n/k^3).

Table of values

List of values

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

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

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