A187866 - cp's OEIS frontend

A187866 Greatest k such that prime(n)(prime(n)-k)-1 and prime(n)(prime(n)-k)+1 are twin primes, k >= 0 and k < prime(n) or -1 if no such k exists.

n	a(n)
1	0
2	1
3	-1
4	1
5	-1
6	-1
7	11
8	7
9	17
10	17
11	-1
12	-1
13	11
14	19
15	41
16	-1
17	41
18	-1
19	43
20	53
21	-1
22	-1
23	29
24	41
25	-1
26	59
27	97
28	101
29	61
30	89
31	-1
32	101
33	131
34	127
35	137
36	73
37	133
38	127
39	137
40	119
41	47
42	163
43	101
44	157
45	131

[0, 1, -1, 1, -1, -1, 11, 7, 17, 17, -1, -1, 11, 19, 41, -1, 41, -1, 43, 53, -1, -1, 29, 41, -1, 59, 97, 101, 61, 89, -1, 101, 131, 127, 137, 73, 133, 127, 137, 119, 47, 163, 101, 157, 131]

cp's OEIS Frontend

A187866 Greatest k such that prime(n)(prime(n)-k)-1 and prime(n)(prime(n)-k)+1 are twin primes, k >= 0 and k < prime(n) or -1 if no such k exists.

Table of values

List of values

n	a(n)
1	0
2	1
3	-1
4	1
5	-1
6	-1
7	11
8	7
9	17
10	17
11	-1
12	-1
13	11
14	19
15	41
16	-1
17	41
18	-1
19	43
20	53
21	-1
22	-1
23	29
24	41
25	-1
26	59
27	97
28	101
29	61
30	89
31	-1
32	101
33	131
34	127
35	137
36	73
37	133
38	127
39	137
40	119
41	47
42	163
43	101
44	157
45	131

n	a(n)
1	0
2	1
3	-1
4	1
5	-1
6	-1
7	11
8	7
9	17
10	17
11	-1
12	-1
13	11
14	19
15	41
16	-1
17	41
18	-1
19	43
20	53
21	-1
22	-1
23	29
24	41
25	-1
26	59
27	97
28	101
29	61
30	89
31	-1
32	101
33	131
34	127
35	137
36	73
37	133
38	127
39	137
40	119
41	47
42	163
43	101
44	157
45	131

cp's OEIS Frontend

A187866 Greatest k such that prime(n)*(prime(n)-k)-1 and prime(n)*(prime(n)-k)+1 are twin primes, k >= 0 and k < prime(n) or -1 if no such k exists.

Table of values

List of values

A187866 Greatest k such that prime(n)(prime(n)-k)-1 and prime(n)(prime(n)-k)+1 are twin primes, k >= 0 and k < prime(n) or -1 if no such k exists.

n	a(n)
1	0
2	1
3	-1
4	1
5	-1
6	-1
7	11
8	7
9	17
10	17
11	-1
12	-1
13	11
14	19
15	41
16	-1
17	41
18	-1
19	43
20	53
21	-1
22	-1
23	29
24	41
25	-1
26	59
27	97
28	101
29	61
30	89
31	-1
32	101
33	131
34	127
35	137
36	73
37	133
38	127
39	137
40	119
41	47
42	163
43	101
44	157
45	131