A069607 - cp's OEIS frontend

A069607 a(1) = 5; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime.

n	a(n)
1	5
2	3
3	23
4	1
5	3
6	9
7	21
8	9
9	21
10	23
11	43
12	3
13	23
14	7
15	21
16	89
17	37
18	21
19	137
20	1
21	119
22	493
23	143
24	133
25	483
26	267
27	179
28	7
29	333
30	359
31	439
32	101
33	33
34	31
35	533
36	19
37	63
38	39
39	333
40	839
41	63
42	693
43	423
44	327
45	73
46	29
47	39
48	21
49	517
50	27
51	99
52	251
53	7
54	411
55	243
56	33
57	149
58	49
59	227
60	283
61	303
62	351
63	303

[5, 3, 23, 1, 3, 9, 21, 9, 21, 23, 43, 3, 23, 7, 21, 89, 37, 21, 137, 1, 119, 493, 143, 133, 483, 267, 179, 7, 333, 359, 439, 101, 33, 31, 533, 19, 63, 39, 333, 839, 63, 693, 423, 327, 73, 29, 39, 21, 517, 27, 99, 251, 7, 411, 243, 33, 149, 49, 227, 283, 303, 351, 303]

cp's OEIS Frontend

A069607 a(1) = 5; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime.

Table of values

List of values

n	a(n)
1	5
2	3
3	23
4	1
5	3
6	9
7	21
8	9
9	21
10	23
11	43
12	3
13	23
14	7
15	21
16	89
17	37
18	21
19	137
20	1
21	119
22	493
23	143
24	133
25	483
26	267
27	179
28	7
29	333
30	359
31	439
32	101
33	33
34	31
35	533
36	19
37	63
38	39
39	333
40	839
41	63
42	693
43	423
44	327
45	73
46	29
47	39
48	21
49	517
50	27
51	99
52	251
53	7
54	411
55	243
56	33
57	149
58	49
59	227
60	283
61	303
62	351
63	303

n	a(n)
1	5
2	3
3	23
4	1
5	3
6	9
7	21
8	9
9	21
10	23
11	43
12	3
13	23
14	7
15	21
16	89
17	37
18	21
19	137
20	1
21	119
22	493
23	143
24	133
25	483
26	267
27	179
28	7
29	333
30	359
31	439
32	101
33	33
34	31
35	533
36	19
37	63
38	39
39	333
40	839
41	63
42	693
43	423
44	327
45	73
46	29
47	39
48	21
49	517
50	27
51	99
52	251
53	7
54	411
55	243
56	33
57	149
58	49
59	227
60	283
61	303
62	351
63	303

n	a(n)
1	5
2	3
3	23
4	1
5	3
6	9
7	21
8	9
9	21
10	23
11	43
12	3
13	23
14	7
15	21
16	89
17	37
18	21
19	137
20	1
21	119
22	493
23	143
24	133
25	483
26	267
27	179
28	7
29	333
30	359
31	439
32	101
33	33
34	31
35	533
36	19
37	63
38	39
39	333
40	839
41	63
42	693
43	423
44	327
45	73
46	29
47	39
48	21
49	517
50	27
51	99
52	251
53	7
54	411
55	243
56	33
57	149
58	49
59	227
60	283
61	303
62	351
63	303