A350853 - cp's OEIS frontend

A350853 a(1) = 2, a(2) = 3; a(n) is the smallest prime not included earlier such that concatenation of three successive terms is a prime.

n	a(n)
1	2
2	3
3	11
4	23
5	31
6	13
7	29
8	7
9	17
10	19
11	37
12	41
13	59
14	79
15	67
16	107
17	47
18	61
19	43
20	113
21	71
22	109
23	89
24	53
25	157
26	97
27	83
28	101
29	73
30	173
31	131
32	223
33	149
34	127
35	197
36	137
37	373
38	139
39	167
40	163
41	179
42	151
43	191
44	193
45	241
46	317
47	211
48	229
49	281
50	103
51	227
52	233
53	283
54	251

[2, 3, 11, 23, 31, 13, 29, 7, 17, 19, 37, 41, 59, 79, 67, 107, 47, 61, 43, 113, 71, 109, 89, 53, 157, 97, 83, 101, 73, 173, 131, 223, 149, 127, 197, 137, 373, 139, 167, 163, 179, 151, 191, 193, 241, 317, 211, 229, 281, 103, 227, 233, 283, 251]

cp's OEIS Frontend

A350853 a(1) = 2, a(2) = 3; a(n) is the smallest prime not included earlier such that concatenation of three successive terms is a prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	11
4	23
5	31
6	13
7	29
8	7
9	17
10	19
11	37
12	41
13	59
14	79
15	67
16	107
17	47
18	61
19	43
20	113
21	71
22	109
23	89
24	53
25	157
26	97
27	83
28	101
29	73
30	173
31	131
32	223
33	149
34	127
35	197
36	137
37	373
38	139
39	167
40	163
41	179
42	151
43	191
44	193
45	241
46	317
47	211
48	229
49	281
50	103
51	227
52	233
53	283
54	251

n	a(n)
1	2
2	3
3	11
4	23
5	31
6	13
7	29
8	7
9	17
10	19
11	37
12	41
13	59
14	79
15	67
16	107
17	47
18	61
19	43
20	113
21	71
22	109
23	89
24	53
25	157
26	97
27	83
28	101
29	73
30	173
31	131
32	223
33	149
34	127
35	197
36	137
37	373
38	139
39	167
40	163
41	179
42	151
43	191
44	193
45	241
46	317
47	211
48	229
49	281
50	103
51	227
52	233
53	283
54	251

n	a(n)
1	2
2	3
3	11
4	23
5	31
6	13
7	29
8	7
9	17
10	19
11	37
12	41
13	59
14	79
15	67
16	107
17	47
18	61
19	43
20	113
21	71
22	109
23	89
24	53
25	157
26	97
27	83
28	101
29	73
30	173
31	131
32	223
33	149
34	127
35	197
36	137
37	373
38	139
39	167
40	163
41	179
42	151
43	191
44	193
45	241
46	317
47	211
48	229
49	281
50	103
51	227
52	233
53	283
54	251