12 Mar
2004
12 Mar
'04
1:14 p.m.
Is it possible to create an infinite string made of the three digits 1, 2, 3 such that no sequence of digits is exactly repeated twice consecutively? In other words 11, 1212, 123123 and 12131213 are all illegal subsequences. I vaguely recall seeing a solution to this question -- I'm pretty sure the answer is yes -- but I can't recall where. -- Scott