A069863 - cp's OEIS frontend

A069863 a(n) is the shortest concatenation of two or more decreasing consecutive numbers (n)(n-1)...(0) such that n divides a(n), or n if there is no such concatenation.

n	a(n)
1	10
2	210
3	321
4	432
5	543210
6	654
7	7
8	8765432
9	987654321
10	109876543210
11	11
12	1211109876
13	13
14	14131211109876
15	151413121110
16	1615141312
17	171615
18	181716151413121110
19	19181716
20	20
21	21
22	2221201918171615141312
23	23

[10, 210, 321, 432, 543210, 654, 7, 8765432, 987654321, 109876543210, 11, 1211109876, 13, 14131211109876, 151413121110, 1615141312, 171615, 181716151413121110, 19181716, 20, 21, 2221201918171615141312, 23]

cp's OEIS Frontend

A069863 a(n) is the shortest concatenation of two or more decreasing consecutive numbers (n)(n-1)...(0) such that n divides a(n), or n if there is no such concatenation.

Table of values

List of values