When he was 17 , he studied the way that triangular and square numbers interleave , and eventually found a recursive relation describing it .
The first AI project by Hofstadter stemmed from his teenage fascination with number sequences .
When Hofstadter was 17 , Hofstadter studied the way that triangular and square numbers interleave , and eventually found a recursive relation describing it .
The first AI project by Hofstadter stemmed from his teenage fascination with number sequences .