A075570 - cp's OEIS frontend

A075570 Lexicographically earliest sequence of distinct composite numbers such that a(k) + a(k+1) is prime for all k.

n	a(n)
1	4
2	9
3	8
4	15
5	14
6	27
7	10
8	21
9	16
10	25
11	6
12	35
13	12
14	49
15	18
16	55
17	24
18	65
19	32
20	39
21	20
22	33
23	26
24	45
25	22
26	51
27	28
28	69
29	34
30	63
31	38
32	75
33	52
34	57
35	40
36	87
37	44
38	93
39	46
40	81
41	50
42	77
43	30
44	119
45	48
46	91
47	36
48	95
49	42
50	85
51	54
52	125
53	56
54	111
55	62
56	105
57	58
58	99
59	64
60	115
61	66
62	133
63	60
64	121
65	70
66	123
67	68
68	129
69	82

[4, 9, 8, 15, 14, 27, 10, 21, 16, 25, 6, 35, 12, 49, 18, 55, 24, 65, 32, 39, 20, 33, 26, 45, 22, 51, 28, 69, 34, 63, 38, 75, 52, 57, 40, 87, 44, 93, 46, 81, 50, 77, 30, 119, 48, 91, 36, 95, 42, 85, 54, 125, 56, 111, 62, 105, 58, 99, 64, 115, 66, 133, 60, 121, 70, 123, 68, 129, 82]

cp's OEIS Frontend

A075570 Lexicographically earliest sequence of distinct composite numbers such that a(k) + a(k+1) is prime for all k.

Table of values

List of values

n	a(n)
1	4
2	9
3	8
4	15
5	14
6	27
7	10
8	21
9	16
10	25
11	6
12	35
13	12
14	49
15	18
16	55
17	24
18	65
19	32
20	39
21	20
22	33
23	26
24	45
25	22
26	51
27	28
28	69
29	34
30	63
31	38
32	75
33	52
34	57
35	40
36	87
37	44
38	93
39	46
40	81
41	50
42	77
43	30
44	119
45	48
46	91
47	36
48	95
49	42
50	85
51	54
52	125
53	56
54	111
55	62
56	105
57	58
58	99
59	64
60	115
61	66
62	133
63	60
64	121
65	70
66	123
67	68
68	129
69	82

n	a(n)
1	4
2	9
3	8
4	15
5	14
6	27
7	10
8	21
9	16
10	25
11	6
12	35
13	12
14	49
15	18
16	55
17	24
18	65
19	32
20	39
21	20
22	33
23	26
24	45
25	22
26	51
27	28
28	69
29	34
30	63
31	38
32	75
33	52
34	57
35	40
36	87
37	44
38	93
39	46
40	81
41	50
42	77
43	30
44	119
45	48
46	91
47	36
48	95
49	42
50	85
51	54
52	125
53	56
54	111
55	62
56	105
57	58
58	99
59	64
60	115
61	66
62	133
63	60
64	121
65	70
66	123
67	68
68	129
69	82

n	a(n)
1	4
2	9
3	8
4	15
5	14
6	27
7	10
8	21
9	16
10	25
11	6
12	35
13	12
14	49
15	18
16	55
17	24
18	65
19	32
20	39
21	20
22	33
23	26
24	45
25	22
26	51
27	28
28	69
29	34
30	63
31	38
32	75
33	52
34	57
35	40
36	87
37	44
38	93
39	46
40	81
41	50
42	77
43	30
44	119
45	48
46	91
47	36
48	95
49	42
50	85
51	54
52	125
53	56
54	111
55	62
56	105
57	58
58	99
59	64
60	115
61	66
62	133
63	60
64	121
65	70
66	123
67	68
68	129
69	82