A244862 - cp's OEIS frontend

A244862 List of pairs of prime numbers (p,q) starting with (2, 3) such that p || q (where || denotes concatenation) is a prime number and the sequence is always extended with the smallest prime not yet present in the sequence.

n	a(n)
1	2
2	3
3	5
4	23
5	7
6	19
7	11
8	17
9	13
10	61
11	29
12	53
13	31
14	37
15	41
16	59
17	43
18	73
19	47
20	83
21	67
22	79
23	71
24	167
25	89
26	101
27	97
28	103
29	107
30	137
31	109
32	139
33	113
34	131
35	127
36	157
37	149
38	173
39	151
40	163
41	179
42	233
43	181
44	193
45	191
46	227
47	197
48	257
49	199
50	211
51	223
52	229
53	239
54	251
55	241
56	271
57	263
58	269
59	277
60	331
61	281
62	317
63	283
64	397
65	293
66	311
67	307
68	337
69	313
70	373
71	347
72	359
73	349
74	379
75	353

[2, 3, 5, 23, 7, 19, 11, 17, 13, 61, 29, 53, 31, 37, 41, 59, 43, 73, 47, 83, 67, 79, 71, 167, 89, 101, 97, 103, 107, 137, 109, 139, 113, 131, 127, 157, 149, 173, 151, 163, 179, 233, 181, 193, 191, 227, 197, 257, 199, 211, 223, 229, 239, 251, 241, 271, 263, 269, 277, 331, 281, 317, 283, 397, 293, 311, 307, 337, 313, 373, 347, 359, 349, 379, 353]

cp's OEIS Frontend

A244862 List of pairs of prime numbers (p,q) starting with (2, 3) such that p || q (where || denotes concatenation) is a prime number and the sequence is always extended with the smallest prime not yet present in the sequence.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	23
5	7
6	19
7	11
8	17
9	13
10	61
11	29
12	53
13	31
14	37
15	41
16	59
17	43
18	73
19	47
20	83
21	67
22	79
23	71
24	167
25	89
26	101
27	97
28	103
29	107
30	137
31	109
32	139
33	113
34	131
35	127
36	157
37	149
38	173
39	151
40	163
41	179
42	233
43	181
44	193
45	191
46	227
47	197
48	257
49	199
50	211
51	223
52	229
53	239
54	251
55	241
56	271
57	263
58	269
59	277
60	331
61	281
62	317
63	283
64	397
65	293
66	311
67	307
68	337
69	313
70	373
71	347
72	359
73	349
74	379
75	353

n	a(n)
1	2
2	3
3	5
4	23
5	7
6	19
7	11
8	17
9	13
10	61
11	29
12	53
13	31
14	37
15	41
16	59
17	43
18	73
19	47
20	83
21	67
22	79
23	71
24	167
25	89
26	101
27	97
28	103
29	107
30	137
31	109
32	139
33	113
34	131
35	127
36	157
37	149
38	173
39	151
40	163
41	179
42	233
43	181
44	193
45	191
46	227
47	197
48	257
49	199
50	211
51	223
52	229
53	239
54	251
55	241
56	271
57	263
58	269
59	277
60	331
61	281
62	317
63	283
64	397
65	293
66	311
67	307
68	337
69	313
70	373
71	347
72	359
73	349
74	379
75	353

n	a(n)
1	2
2	3
3	5
4	23
5	7
6	19
7	11
8	17
9	13
10	61
11	29
12	53
13	31
14	37
15	41
16	59
17	43
18	73
19	47
20	83
21	67
22	79
23	71
24	167
25	89
26	101
27	97
28	103
29	107
30	137
31	109
32	139
33	113
34	131
35	127
36	157
37	149
38	173
39	151
40	163
41	179
42	233
43	181
44	193
45	191
46	227
47	197
48	257
49	199
50	211
51	223
52	229
53	239
54	251
55	241
56	271
57	263
58	269
59	277
60	331
61	281
62	317
63	283
64	397
65	293
66	311
67	307
68	337
69	313
70	373
71	347
72	359
73	349
74	379
75	353