A330290 - cp's OEIS frontend

A330290 a(1) = 1; for n > 1, a(n) = the smallest divisor of the number formed by the concatenation of a(1) to a(n-1) that has not previously appeared in the sequence.

n	a(n)
1	1
2	1
3	11
4	101
5	3
6	9
7	7
8	61
9	1821477701
10	311
11	449
12	89
13	29
14	37
15	121
16	349
17	1047
18	73
19	2741
20	59
21	5527
22	21
23	487
24	3679724250117316595527
25	137
26	257
27	33
28	99
29	27
30	47
31	17
32	19
33	13
34	39
35	63
36	23
37	557
38	53
39	159
40	117
41	351
42	81
43	3439913
44	677
45	83
46	197
47	151
48	453
49	211
50	1033
51	239296537198126662281
52	167
53	501

[1, 1, 11, 101, 3, 9, 7, 61, 1821477701, 311, 449, 89, 29, 37, 121, 349, 1047, 73, 2741, 59, 5527, 21, 487, 3679724250117316595527, 137, 257, 33, 99, 27, 47, 17, 19, 13, 39, 63, 23, 557, 53, 159, 117, 351, 81, 3439913, 677, 83, 197, 151, 453, 211, 1033, 239296537198126662281, 167, 501]

cp's OEIS Frontend

A330290 a(1) = 1; for n > 1, a(n) = the smallest divisor of the number formed by the concatenation of a(1) to a(n-1) that has not previously appeared in the sequence.

Table of values

List of values