OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
eoe4Q[n_]:=Module[{c=If[EvenQ[Length[#]], 1, 0]&/@Split[ IntegerDigits[ n, 4]]}, c==PadRight[{}, Length[c], {1, 0}]]; Select[Range[1000], eoe4Q] (* Harvey P. Dale, Jun 01 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved