A074239 - cp's OEIS frontend

A074239 Related to cumulative number of non-twin primes.

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

[0, 0, 0, 1, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 9, 9, 10, 11, 11, 12, 13, 14, 15, 16, 16, 17, 17, 18, 19, 20, 21, 21, 22, 22, 23, 24, 25, 26, 27, 27, 28, 28, 29, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 40, 41, 42, 43, 43, 44, 45, 46, 47, 47, 48, 49, 50]

cp's OEIS Frontend

A074239 Related to cumulative number of non-twin primes.

Table of values

List of values

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

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

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