A218447 - cp's OEIS frontend

A218447 a(n) = Sum_{k>=0} floor(n/(5*k + 4)).

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

[0, 0, 0, 0, 1, 1, 1, 1, 2, 3, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 9, 9, 9, 9, 11, 11, 11, 12, 14, 15, 15, 15, 16, 16, 17, 17, 19, 19, 20, 21, 22, 22, 23, 23, 25, 26, 26, 26, 28, 29, 29, 29, 30, 30, 32, 32, 34, 35, 36, 37, 38, 38, 38, 39, 41, 41, 41, 41, 43, 44, 45, 45, 48, 48, 49, 49, 51, 51, 52, 53, 54]

cp's OEIS Frontend

A218447 a(n) = Sum_{k>=0} floor(n/(5*k + 4)).

Table of values

List of values

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

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

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