OFFSET
0,2
EXAMPLE
a(2)=3 because 2 appears a total of 3 times in the two sequences: once in A001477, once as a(1) in this sequence and once as a(3). The number 2 cannot be chosen as a(2) because that would mark the third appearance of 2, creating a contradiction; neither a(2)=3 nor the subsequent a(3)=2 creates any contradiction, however.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Matthew Vandermast, Mar 17 2003
EXTENSIONS
Definition edited by Benoit Jubin, May 01 2010
STATUS
approved