OFFSET
0,1
COMMENTS
Also: Numbers whose binary representation is a substring of the concatenation of the binary representation of all smaller nonnegative integers not listed earlier. - M. F. Hasler, Dec 29 2012
LINKS
EXAMPLE
The first term is 3, smallest integer whose binary representation "11"[2] is a substring of the concatenation of the smaller numbers 0,1,2 ~> concat(0,1,10)="0110".
Next is 5="101"[2], which is a substring of concat(0,1,2="10",4="100") = "0110100". Note that 3, since it occurs earlier, is excluded from the list of numbers which are concatenated. - M. F. Hasler, Dec 29 2012
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Nick Hobson, Feb 24 2007
STATUS
approved