OFFSET
0,1
EXAMPLE
The binary representation of 20 is 10100. This occurs in the concatenation of terms a(0) through a(19) like so: 01(10100)1100100111100. So a(20) = 0.
MATHEMATICA
f[l_List]:=Append[l, Boole[StringPosition[ToString[FromDigits[l]], ToString[FromDigits[IntegerDigits[Length[l], 2]]]]=={}]]; Nest[f, {0}, 125] [From Ray Chandler, Nov 09 2008]
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Leroy Quet, Jul 30 2008
EXTENSIONS
Extended by Ray Chandler, Nov 09 2008
STATUS
approved