A069609 - cp's OEIS frontend

A069609 a(1) = 7; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime.

n	a(n)
1	7
2	1
3	9
4	3
5	3
6	3
7	17
8	7
9	11
10	37
11	11
12	9
13	31
14	9
15	17
16	13
17	93
18	3
19	167
20	67
21	119
22	93
23	31
24	33
25	143
26	99
27	297
28	91
29	69
30	83
31	1
32	33
33	23
34	27
35	199
36	333
37	123
38	549
39	17
40	67
41	141
42	33
43	39
44	167
45	21
46	217
47	279
48	419
49	69
50	517
51	71
52	451
53	171
54	39
55	191
56	93
57	43
58	11
59	303
60	777
61	33
62	67
63	207
64	369
65	489

[7, 1, 9, 3, 3, 3, 17, 7, 11, 37, 11, 9, 31, 9, 17, 13, 93, 3, 167, 67, 119, 93, 31, 33, 143, 99, 297, 91, 69, 83, 1, 33, 23, 27, 199, 333, 123, 549, 17, 67, 141, 33, 39, 167, 21, 217, 279, 419, 69, 517, 71, 451, 171, 39, 191, 93, 43, 11, 303, 777, 33, 67, 207, 369, 489]

cp's OEIS Frontend

A069609 a(1) = 7; 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	7
2	1
3	9
4	3
5	3
6	3
7	17
8	7
9	11
10	37
11	11
12	9
13	31
14	9
15	17
16	13
17	93
18	3
19	167
20	67
21	119
22	93
23	31
24	33
25	143
26	99
27	297
28	91
29	69
30	83
31	1
32	33
33	23
34	27
35	199
36	333
37	123
38	549
39	17
40	67
41	141
42	33
43	39
44	167
45	21
46	217
47	279
48	419
49	69
50	517
51	71
52	451
53	171
54	39
55	191
56	93
57	43
58	11
59	303
60	777
61	33
62	67
63	207
64	369
65	489

n	a(n)
1	7
2	1
3	9
4	3
5	3
6	3
7	17
8	7
9	11
10	37
11	11
12	9
13	31
14	9
15	17
16	13
17	93
18	3
19	167
20	67
21	119
22	93
23	31
24	33
25	143
26	99
27	297
28	91
29	69
30	83
31	1
32	33
33	23
34	27
35	199
36	333
37	123
38	549
39	17
40	67
41	141
42	33
43	39
44	167
45	21
46	217
47	279
48	419
49	69
50	517
51	71
52	451
53	171
54	39
55	191
56	93
57	43
58	11
59	303
60	777
61	33
62	67
63	207
64	369
65	489

n	a(n)
1	7
2	1
3	9
4	3
5	3
6	3
7	17
8	7
9	11
10	37
11	11
12	9
13	31
14	9
15	17
16	13
17	93
18	3
19	167
20	67
21	119
22	93
23	31
24	33
25	143
26	99
27	297
28	91
29	69
30	83
31	1
32	33
33	23
34	27
35	199
36	333
37	123
38	549
39	17
40	67
41	141
42	33
43	39
44	167
45	21
46	217
47	279
48	419
49	69
50	517
51	71
52	451
53	171
54	39
55	191
56	93
57	43
58	11
59	303
60	777
61	33
62	67
63	207
64	369
65	489