A172054 - cp's OEIS frontend

A172054 n-th number k such that 6k-1 is composite while 6k+1 is prime minus n-th number m such that 6m-1 is prime while 6m+1 is composite.

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

[2, 3, 4, 2, 6, 7, 5, 7, 8, 7, 9, 12, 12, 12, 9, 4, 6, 4, 8, 9, 7, 8, 12, 11, 14, 17, 17, 12, 18, 17, 19, 13, 13, 10, 11, 9, 8, 7, 15, 17, 18, 13, 12, 13, 13, 11, 11, 15, 19, 19, 23, 23, 19, 12, 16, 17, 12, 11, 18, 22, 27, 29, 27, 27, 25, 18, 27, 28, 23, 22, 23, 17, 21, 24, 23, 23, 30]

cp's OEIS Frontend

A172054 n-th number k such that 6k-1 is composite while 6k+1 is prime minus n-th number m such that 6m-1 is prime while 6m+1 is composite.

Table of values

List of values

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

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

cp's OEIS Frontend

A172054 n-th number k such that 6*k-1 is composite while 6*k+1 is prime minus n-th number m such that 6*m-1 is prime while 6*m+1 is composite.

Table of values

List of values

A172054 n-th number k such that 6k-1 is composite while 6k+1 is prime minus n-th number m such that 6m-1 is prime while 6m+1 is composite.

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