[seqfan] Noninterfering picket fence seeds

[Ron Hardin]

Take n integers in x(i) in 1..L such that (x(j)-x(i)) mod (x(k)-x(i)) is nonzero for every disjoint triple i,j,k

What is the smallest L that allows n such integers to exist?  I get

n L
1 1
2 2
3 6
4 8
5 18
6 21
7 33
8 38
9 54
10 66

It starts like A024431  1 2 6 8 18 21 44 52 106 which seems word-wise related.



 rhhardin at mindspring.com
rhhardin at att.net (either)