A277688 - cp's OEIS frontend

A277688 Odd numbers k such that there is no prime p < k/2 with k - 2p and k + 2p both prime.

n	a(n)
1	1
2	3
3	5
4	19
5	29
6	31
7	43
8	49
9	55
10	59
11	61
12	71
13	79
14	83
15	89
16	91
17	101
18	109
19	113
20	115
21	119
22	125
23	127
24	131
25	139
26	149
27	151
28	155
29	161
30	163
31	167
32	169
33	175
34	179
35	191
36	193
37	197
38	199
39	203
40	209
41	211
42	215
43	223
44	227
45	229
46	239
47	241
48	247
49	251
50	253
51	259
52	265
53	269
54	271
55	281
56	283

[1, 3, 5, 19, 29, 31, 43, 49, 55, 59, 61, 71, 79, 83, 89, 91, 101, 109, 113, 115, 119, 125, 127, 131, 139, 149, 151, 155, 161, 163, 167, 169, 175, 179, 191, 193, 197, 199, 203, 209, 211, 215, 223, 227, 229, 239, 241, 247, 251, 253, 259, 265, 269, 271, 281, 283]

cp's OEIS Frontend

A277688 Odd numbers k such that there is no prime p < k/2 with k - 2p and k + 2p both prime.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	19
5	29
6	31
7	43
8	49
9	55
10	59
11	61
12	71
13	79
14	83
15	89
16	91
17	101
18	109
19	113
20	115
21	119
22	125
23	127
24	131
25	139
26	149
27	151
28	155
29	161
30	163
31	167
32	169
33	175
34	179
35	191
36	193
37	197
38	199
39	203
40	209
41	211
42	215
43	223
44	227
45	229
46	239
47	241
48	247
49	251
50	253
51	259
52	265
53	269
54	271
55	281
56	283

n	a(n)
1	1
2	3
3	5
4	19
5	29
6	31
7	43
8	49
9	55
10	59
11	61
12	71
13	79
14	83
15	89
16	91
17	101
18	109
19	113
20	115
21	119
22	125
23	127
24	131
25	139
26	149
27	151
28	155
29	161
30	163
31	167
32	169
33	175
34	179
35	191
36	193
37	197
38	199
39	203
40	209
41	211
42	215
43	223
44	227
45	229
46	239
47	241
48	247
49	251
50	253
51	259
52	265
53	269
54	271
55	281
56	283

cp's OEIS Frontend

A277688 Odd numbers k such that there is no prime p < k/2 with k - 2*p and k + 2*p both prime.

Table of values

List of values

A277688 Odd numbers k such that there is no prime p < k/2 with k - 2p and k + 2p both prime.

n	a(n)
1	1
2	3
3	5
4	19
5	29
6	31
7	43
8	49
9	55
10	59
11	61
12	71
13	79
14	83
15	89
16	91
17	101
18	109
19	113
20	115
21	119
22	125
23	127
24	131
25	139
26	149
27	151
28	155
29	161
30	163
31	167
32	169
33	175
34	179
35	191
36	193
37	197
38	199
39	203
40	209
41	211
42	215
43	223
44	227
45	229
46	239
47	241
48	247
49	251
50	253
51	259
52	265
53	269
54	271
55	281
56	283