A309081 - cp's OEIS frontend

A309081 a(n) = n - floor(n/2^2) + floor(n/3^2) - floor(n/4^2) + ...

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

[1, 2, 3, 3, 4, 5, 6, 6, 8, 9, 10, 10, 11, 12, 13, 12, 13, 15, 16, 16, 17, 18, 19, 19, 21, 22, 24, 24, 25, 26, 27, 26, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 37, 38, 39, 38, 40, 42, 43, 43, 44, 46, 47, 47, 48, 49, 50, 50, 51, 52, 54, 52, 53, 54, 55, 55, 56, 57, 58, 58, 59, 60, 62]

cp's OEIS Frontend

A309081 a(n) = n - floor(n/2^2) + floor(n/3^2) - floor(n/4^2) + ...

Table of values

List of values

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

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

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