OFFSET
1,1
COMMENTS
Or, no base-2 digit of a(n) is a base-4 digit of a(n).
LINKS
FORMULA
a(0) = 0, a(2*n) = 4*a(n-1) + 3, a(2*n+1) = 4*a(n)+2. - Robert Israel, May 05 2014
MAPLE
A032804:= proc(n) option remember;
if n::even then 4*procname(n/2-1)+3
else 4*procname((n-1)/2)+2
fi
end proc;
A032804(0):=0; # Robert Israel, May 05 2014
MATHEMATICA
Select[Range[1000], Min[IntegerDigits[#, 4]]>1&] (* Harvey P. Dale, Dec 23 2013 *)
Table[FromDigits[#, 4]&/@Tuples[{2, 3}, n], {n, 5}]//Flatten (* Harvey P. Dale, Jun 09 2024 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved