A385579 - cp's OEIS frontend

A385579 Smallest prime factor that the repunit(n) = (10^n-1)/9 shares with at least one other binary vector of the same length in base 10, or 1 if they are coprime.

n	a(n)
0	1
1	1
2	1
3	1
4	11
5	1
6	3
7	1
8	11
9	3
10	11
11	1
12	3
13	53
14	11
15	3
16	11
17	1
18	3
19	1
20	11
21	3
22	11
23	1
24	3
25	41
26	11
27	3
28	11
29	3191
30	3
31	2791
32	11
33	3
34	11
35	41
36	3
37	2028119
38	11
39	3
40	11
41	83
42	3
43	173
44	11
45	3
46	11
47	35121409
48	3
49	239
50	11
51	3
52	11
53	107
54	3
55	41
56	11
57	3
58	11

[1, 1, 1, 1, 11, 1, 3, 1, 11, 3, 11, 1, 3, 53, 11, 3, 11, 1, 3, 1, 11, 3, 11, 1, 3, 41, 11, 3, 11, 3191, 3, 2791, 11, 3, 11, 41, 3, 2028119, 11, 3, 11, 83, 3, 173, 11, 3, 11, 35121409, 3, 239, 11, 3, 11, 107, 3, 41, 11, 3, 11]

cp's OEIS Frontend

A385579 Smallest prime factor that the repunit(n) = (10^n-1)/9 shares with at least one other binary vector of the same length in base 10, or 1 if they are coprime.

Table of values

List of values