A369610 - cp's OEIS frontend

A369610 a(n) is the number of nonprime numbers < prime(n) which are not equal to twice a prime.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	4
7	6
8	7
9	9
10	13
11	14
12	18
13	20
14	21
15	23
16	28
17	32
18	33
19	37
20	40
21	41
22	45
23	47
24	51
25	57
26	60
27	61
28	63
29	64
30	67
31	78
32	81
33	85
34	86
35	93
36	94
37	99
38	103
39	105
40	110
41	114
42	115
43	124
44	125
45	127
46	128
47	137
48	146
49	148
50	149
51	152
52	157
53	158
54	167
55	171
56	175
57	180
58	181
59	185
60	187
61	188
62	197
63	208
64	211

[1, 1, 1, 1, 3, 4, 6, 7, 9, 13, 14, 18, 20, 21, 23, 28, 32, 33, 37, 40, 41, 45, 47, 51, 57, 60, 61, 63, 64, 67, 78, 81, 85, 86, 93, 94, 99, 103, 105, 110, 114, 115, 124, 125, 127, 128, 137, 146, 148, 149, 152, 157, 158, 167, 171, 175, 180, 181, 185, 187, 188, 197, 208, 211]

cp's OEIS Frontend

A369610 a(n) is the number of nonprime numbers < prime(n) which are not equal to twice a prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	4
7	6
8	7
9	9
10	13
11	14
12	18
13	20
14	21
15	23
16	28
17	32
18	33
19	37
20	40
21	41
22	45
23	47
24	51
25	57
26	60
27	61
28	63
29	64
30	67
31	78
32	81
33	85
34	86
35	93
36	94
37	99
38	103
39	105
40	110
41	114
42	115
43	124
44	125
45	127
46	128
47	137
48	146
49	148
50	149
51	152
52	157
53	158
54	167
55	171
56	175
57	180
58	181
59	185
60	187
61	188
62	197
63	208
64	211

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	4
7	6
8	7
9	9
10	13
11	14
12	18
13	20
14	21
15	23
16	28
17	32
18	33
19	37
20	40
21	41
22	45
23	47
24	51
25	57
26	60
27	61
28	63
29	64
30	67
31	78
32	81
33	85
34	86
35	93
36	94
37	99
38	103
39	105
40	110
41	114
42	115
43	124
44	125
45	127
46	128
47	137
48	146
49	148
50	149
51	152
52	157
53	158
54	167
55	171
56	175
57	180
58	181
59	185
60	187
61	188
62	197
63	208
64	211

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	4
7	6
8	7
9	9
10	13
11	14
12	18
13	20
14	21
15	23
16	28
17	32
18	33
19	37
20	40
21	41
22	45
23	47
24	51
25	57
26	60
27	61
28	63
29	64
30	67
31	78
32	81
33	85
34	86
35	93
36	94
37	99
38	103
39	105
40	110
41	114
42	115
43	124
44	125
45	127
46	128
47	137
48	146
49	148
50	149
51	152
52	157
53	158
54	167
55	171
56	175
57	180
58	181
59	185
60	187
61	188
62	197
63	208
64	211