A282539 - cp's OEIS frontend

A282539 a(1)=1, a(n) is the smallest integer not included earlier such that a(n)a(n-1)-1 and a(n)a(n-1)+1 are twin primes.

n	a(n)
1	1
2	4
3	3
4	2
5	6
6	5
7	12
8	9
9	8
10	24
11	10
12	15
13	16
14	27
15	30
16	14
17	33
18	20
19	21
20	22
21	39
22	28
23	51
24	42
25	11
26	18
27	29
28	72
29	26
30	57
31	74
32	45
33	36
34	23
35	84
36	13
37	66
38	7
39	60
40	17
41	126
42	38
43	111
44	68
45	54
46	37
47	90
48	31
49	48
50	44
51	75
52	34
53	63
54	56
55	105
56	32
57	81
58	50
59	93
60	106
61	138
62	40
63	78
64	19
65	222
66	110
67	69
68	58

[1, 4, 3, 2, 6, 5, 12, 9, 8, 24, 10, 15, 16, 27, 30, 14, 33, 20, 21, 22, 39, 28, 51, 42, 11, 18, 29, 72, 26, 57, 74, 45, 36, 23, 84, 13, 66, 7, 60, 17, 126, 38, 111, 68, 54, 37, 90, 31, 48, 44, 75, 34, 63, 56, 105, 32, 81, 50, 93, 106, 138, 40, 78, 19, 222, 110, 69, 58]

cp's OEIS Frontend

A282539 a(1)=1, a(n) is the smallest integer not included earlier such that a(n)a(n-1)-1 and a(n)a(n-1)+1 are twin primes.

Table of values

List of values

n	a(n)
1	1
2	4
3	3
4	2
5	6
6	5
7	12
8	9
9	8
10	24
11	10
12	15
13	16
14	27
15	30
16	14
17	33
18	20
19	21
20	22
21	39
22	28
23	51
24	42
25	11
26	18
27	29
28	72
29	26
30	57
31	74
32	45
33	36
34	23
35	84
36	13
37	66
38	7
39	60
40	17
41	126
42	38
43	111
44	68
45	54
46	37
47	90
48	31
49	48
50	44
51	75
52	34
53	63
54	56
55	105
56	32
57	81
58	50
59	93
60	106
61	138
62	40
63	78
64	19
65	222
66	110
67	69
68	58

n	a(n)
1	1
2	4
3	3
4	2
5	6
6	5
7	12
8	9
9	8
10	24
11	10
12	15
13	16
14	27
15	30
16	14
17	33
18	20
19	21
20	22
21	39
22	28
23	51
24	42
25	11
26	18
27	29
28	72
29	26
30	57
31	74
32	45
33	36
34	23
35	84
36	13
37	66
38	7
39	60
40	17
41	126
42	38
43	111
44	68
45	54
46	37
47	90
48	31
49	48
50	44
51	75
52	34
53	63
54	56
55	105
56	32
57	81
58	50
59	93
60	106
61	138
62	40
63	78
64	19
65	222
66	110
67	69
68	58

cp's OEIS Frontend

A282539 a(1)=1, a(n) is the smallest integer not included earlier such that a(n)*a(n-1)-1 and a(n)*a(n-1)+1 are twin primes.

Table of values

List of values

A282539 a(1)=1, a(n) is the smallest integer not included earlier such that a(n)a(n-1)-1 and a(n)a(n-1)+1 are twin primes.

n	a(n)
1	1
2	4
3	3
4	2
5	6
6	5
7	12
8	9
9	8
10	24
11	10
12	15
13	16
14	27
15	30
16	14
17	33
18	20
19	21
20	22
21	39
22	28
23	51
24	42
25	11
26	18
27	29
28	72
29	26
30	57
31	74
32	45
33	36
34	23
35	84
36	13
37	66
38	7
39	60
40	17
41	126
42	38
43	111
44	68
45	54
46	37
47	90
48	31
49	48
50	44
51	75
52	34
53	63
54	56
55	105
56	32
57	81
58	50
59	93
60	106
61	138
62	40
63	78
64	19
65	222
66	110
67	69
68	58