A329876 - cp's OEIS frontend

A329876 Lexicographically earliest sequence of positive integers such that for n > 1, the concatenation of a(n), a(n-1), ..., a(1), in decimal, is a prime number.

n	a(n)
1	1
2	1
3	2
4	4
5	3
6	2
7	4
8	15
9	3
10	9
11	20
12	4
13	3
14	11
15	31
16	6
17	24
18	23
19	82
20	11
21	21
22	3
23	22
24	20
25	63
26	19
27	56
28	22
29	17
30	42
31	105
32	31
33	2
34	4
35	27
36	96
37	42
38	5
39	72
40	19
41	20
42	22
43	32
44	102
45	31
46	104
47	4
48	24
49	95
50	21
51	13
52	12
53	9
54	38
55	3
56	58
57	38
58	78
59	31
60	119
61	31
62	45
63	107
64	42
65	12
66	9
67	21
68	66
69	181

[1, 1, 2, 4, 3, 2, 4, 15, 3, 9, 20, 4, 3, 11, 31, 6, 24, 23, 82, 11, 21, 3, 22, 20, 63, 19, 56, 22, 17, 42, 105, 31, 2, 4, 27, 96, 42, 5, 72, 19, 20, 22, 32, 102, 31, 104, 4, 24, 95, 21, 13, 12, 9, 38, 3, 58, 38, 78, 31, 119, 31, 45, 107, 42, 12, 9, 21, 66, 181]

cp's OEIS Frontend

A329876 Lexicographically earliest sequence of positive integers such that for n > 1, the concatenation of a(n), a(n-1), ..., a(1), in decimal, is a prime number.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	4
5	3
6	2
7	4
8	15
9	3
10	9
11	20
12	4
13	3
14	11
15	31
16	6
17	24
18	23
19	82
20	11
21	21
22	3
23	22
24	20
25	63
26	19
27	56
28	22
29	17
30	42
31	105
32	31
33	2
34	4
35	27
36	96
37	42
38	5
39	72
40	19
41	20
42	22
43	32
44	102
45	31
46	104
47	4
48	24
49	95
50	21
51	13
52	12
53	9
54	38
55	3
56	58
57	38
58	78
59	31
60	119
61	31
62	45
63	107
64	42
65	12
66	9
67	21
68	66
69	181

n	a(n)
1	1
2	1
3	2
4	4
5	3
6	2
7	4
8	15
9	3
10	9
11	20
12	4
13	3
14	11
15	31
16	6
17	24
18	23
19	82
20	11
21	21
22	3
23	22
24	20
25	63
26	19
27	56
28	22
29	17
30	42
31	105
32	31
33	2
34	4
35	27
36	96
37	42
38	5
39	72
40	19
41	20
42	22
43	32
44	102
45	31
46	104
47	4
48	24
49	95
50	21
51	13
52	12
53	9
54	38
55	3
56	58
57	38
58	78
59	31
60	119
61	31
62	45
63	107
64	42
65	12
66	9
67	21
68	66
69	181

n	a(n)
1	1
2	1
3	2
4	4
5	3
6	2
7	4
8	15
9	3
10	9
11	20
12	4
13	3
14	11
15	31
16	6
17	24
18	23
19	82
20	11
21	21
22	3
23	22
24	20
25	63
26	19
27	56
28	22
29	17
30	42
31	105
32	31
33	2
34	4
35	27
36	96
37	42
38	5
39	72
40	19
41	20
42	22
43	32
44	102
45	31
46	104
47	4
48	24
49	95
50	21
51	13
52	12
53	9
54	38
55	3
56	58
57	38
58	78
59	31
60	119
61	31
62	45
63	107
64	42
65	12
66	9
67	21
68	66
69	181