A077187 - cp's OEIS frontend

A077187 Smallest k such that the concatenation 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1) is a multiple of prime(n), or 0 if no such number exists.

n	a(n)
1	0
2	3
3	0
4	6
5	2
6	6
7	109
8	103
9	100001
10	1006
11	17
12	3
13	5
14	103
15	1000002
16	100012
17	1019
18	1002
19	1001
20	16
21	8
22	105
23	1036
24	104
25	1002
26	4
27	100000000009
28	100004
29	52
30	156
31	10000000012
32	1062
33	8
34	1002
35	28
36	102
37	1011
38	1000062
39	30
40	10001
41	118
42	52
43	43
44	10058
45	34
46	47

[0, 3, 0, 6, 2, 6, 109, 103, 100001, 1006, 17, 3, 5, 103, 1000002, 100012, 1019, 1002, 1001, 16, 8, 105, 1036, 104, 1002, 4, 100000000009, 100004, 52, 156, 10000000012, 1062, 8, 1002, 28, 102, 1011, 1000062, 30, 10001, 118, 52, 43, 10058, 34, 47]

cp's OEIS Frontend

A077187 Smallest k such that the concatenation 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1) is a multiple of prime(n), or 0 if no such number exists.

Table of values

List of values