A269849 - cp's OEIS frontend

A269849 a(n) = number of integers k <= n for which prime(k+1)-prime(k) is not a multiple of three.

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

[1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 11, 12, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 18, 19, 20, 21, 22, 23, 24, 24, 25, 26, 27, 27, 27, 28, 28, 28, 29, 30, 31, 32, 33, 33, 33, 34, 35, 36, 36, 37, 38, 38, 38, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 47, 48, 49, 50, 50, 51, 51, 51, 52, 52, 53, 54, 55, 56, 57, 58, 59, 59, 60]

cp's OEIS Frontend

A269849 a(n) = number of integers k <= n for which prime(k+1)-prime(k) is not a multiple of three.

Table of values

List of values

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

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

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