A176168 - OEIS

A176168

Length of shortest series s(1..a(n))>0, with s(1)=1 and |s(i+1)-s(i)|=i and no value s(i) repeated, containing all the values 1..n

1, 2, 5, 5, 13, 17, 17, 20, 29, 36, 37, 37, 37, 37, 41, 45, 45, 56, 56, 58, 58, 58, 62, 62, 62, 62, 77, 77, 81, 81, 88, 89, 89, 89, 89, 89, 89, 89, 89, 89, 106, 106, 107, 107, 109, 113, 120, 121, 125, 125, 125, 125, 128, 128, 128, 132, 132, 132, 132, 144, 145, 148, 148, 148

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

A series of finite versions of an infinite problem suggested on the Sequence Fans Mailing List

LINKS

R. H. Hardin, Table of n, a(n) for n=1..80

R. H. Hardin, Shortest series s(1..a(n)), n=1..80

EXAMPLE

a(5)=13 because the shortest series s() containing 1..5 is: 1 2 4 7 3 8 14 21 29 38 28 17 5

CROSSREFS

For encoded series see A176169