A358344 - cp's OEIS frontend

A358344 a(1) = 0; a(n) = the smallest number such that the concatenation a(1)a(2)...a(n) is prime in the smallest allowed base; sequence terminates at index m if a(1)a(2)...a(m)k is composite in the smallest allowed base for all k.

n	a(n)
1	0
2	2
3	1
4	2
5	2
6	3
7	1
8	5
9	9
10	7
11	21
12	5
13	31
14	49
15	39
16	104
17	2
18	34
19	44
20	74
21	22
22	64
23	16
24	107
25	549
26	81
27	207
28	273
29	87
30	497
31	27
32	556
33	42
34	150
35	32
36	44
37	144
38	340
39	28
40	198
41	677
42	13
43	61
44	209
45	377
46	893
47	329
48	391
49	49
50	83
51	425
52	197
53	1017
54	205
55	191
56	163
57	1131
58	291
59	281
60	295
61	389

[0, 2, 1, 2, 2, 3, 1, 5, 9, 7, 21, 5, 31, 49, 39, 104, 2, 34, 44, 74, 22, 64, 16, 107, 549, 81, 207, 273, 87, 497, 27, 556, 42, 150, 32, 44, 144, 340, 28, 198, 677, 13, 61, 209, 377, 893, 329, 391, 49, 83, 425, 197, 1017, 205, 191, 163, 1131, 291, 281, 295, 389]

cp's OEIS Frontend

A358344 a(1) = 0; a(n) = the smallest number such that the concatenation a(1)a(2)...a(n) is prime in the smallest allowed base; sequence terminates at index m if a(1)a(2)...a(m)k is composite in the smallest allowed base for all k.

Table of values

List of values