A376759 - cp's OEIS frontend

A376759 Number of composite numbers c with n < c <= 2*n.

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	4
7	5
8	6
9	6
10	6
11	8
12	8
13	10
14	11
15	11
16	11
17	13
18	14
19	15
20	16
21	16
22	16
23	18
24	18
25	19
26	20
27	20
28	21
29	23
30	23
31	24
32	25
33	26
34	26
35	27
36	27
37	28
38	29
39	30
40	30
41	32
42	32
43	34
44	35
45	35
46	36
47	38
48	39
49	39
50	40
51	40
52	40
53	42
54	42
55	42
56	43
57	43
58	44
59	46
60	47
61	49
62	50
63	51
64	51
65	52
66	52
67	54
68	55
69	55
70	55
71	57
72	58
73	60
74	61
75	61
76	61
77	62
78	63
79	64
80	65
81	66
82	66
83	68
84	68
85	69
86	70
87	70
88	71
89	73
90	73
91	73
92	74
93	75
94	76
95	77
96	77

[0, 1, 2, 2, 4, 4, 5, 6, 6, 6, 8, 8, 10, 11, 11, 11, 13, 14, 15, 16, 16, 16, 18, 18, 19, 20, 20, 21, 23, 23, 24, 25, 26, 26, 27, 27, 28, 29, 30, 30, 32, 32, 34, 35, 35, 36, 38, 39, 39, 40, 40, 40, 42, 42, 42, 43, 43, 44, 46, 47, 49, 50, 51, 51, 52, 52, 54, 55, 55, 55, 57, 58, 60, 61, 61, 61, 62, 63, 64, 65, 66, 66, 68, 68, 69, 70, 70, 71, 73, 73, 73, 74, 75, 76, 77, 77]

cp's OEIS Frontend

A376759 Number of composite numbers c with n < c <= 2*n.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	4
7	5
8	6
9	6
10	6
11	8
12	8
13	10
14	11
15	11
16	11
17	13
18	14
19	15
20	16
21	16
22	16
23	18
24	18
25	19
26	20
27	20
28	21
29	23
30	23
31	24
32	25
33	26
34	26
35	27
36	27
37	28
38	29
39	30
40	30
41	32
42	32
43	34
44	35
45	35
46	36
47	38
48	39
49	39
50	40
51	40
52	40
53	42
54	42
55	42
56	43
57	43
58	44
59	46
60	47
61	49
62	50
63	51
64	51
65	52
66	52
67	54
68	55
69	55
70	55
71	57
72	58
73	60
74	61
75	61
76	61
77	62
78	63
79	64
80	65
81	66
82	66
83	68
84	68
85	69
86	70
87	70
88	71
89	73
90	73
91	73
92	74
93	75
94	76
95	77
96	77

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	4
7	5
8	6
9	6
10	6
11	8
12	8
13	10
14	11
15	11
16	11
17	13
18	14
19	15
20	16
21	16
22	16
23	18
24	18
25	19
26	20
27	20
28	21
29	23
30	23
31	24
32	25
33	26
34	26
35	27
36	27
37	28
38	29
39	30
40	30
41	32
42	32
43	34
44	35
45	35
46	36
47	38
48	39
49	39
50	40
51	40
52	40
53	42
54	42
55	42
56	43
57	43
58	44
59	46
60	47
61	49
62	50
63	51
64	51
65	52
66	52
67	54
68	55
69	55
70	55
71	57
72	58
73	60
74	61
75	61
76	61
77	62
78	63
79	64
80	65
81	66
82	66
83	68
84	68
85	69
86	70
87	70
88	71
89	73
90	73
91	73
92	74
93	75
94	76
95	77
96	77

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	4
7	5
8	6
9	6
10	6
11	8
12	8
13	10
14	11
15	11
16	11
17	13
18	14
19	15
20	16
21	16
22	16
23	18
24	18
25	19
26	20
27	20
28	21
29	23
30	23
31	24
32	25
33	26
34	26
35	27
36	27
37	28
38	29
39	30
40	30
41	32
42	32
43	34
44	35
45	35
46	36
47	38
48	39
49	39
50	40
51	40
52	40
53	42
54	42
55	42
56	43
57	43
58	44
59	46
60	47
61	49
62	50
63	51
64	51
65	52
66	52
67	54
68	55
69	55
70	55
71	57
72	58
73	60
74	61
75	61
76	61
77	62
78	63
79	64
80	65
81	66
82	66
83	68
84	68
85	69
86	70
87	70
88	71
89	73
90	73
91	73
92	74
93	75
94	76
95	77
96	77