%I
%S 1,0,0,4,0,0,16,0,0,64,0,0,256,0,0,0,0,0,4096,0,0,16384,0,0,65536,0,0,
%T 0,0,0,1048576,0,0,0,0,0,16777216,0,0,67108864,0,0,268435456,0,0,
%U 4398046511104,0,0,0,0,0,0,0,0,0,0,0,4294967296,0,0,17179869184,0,0
%N Smallest power of 4 with digit sum n, or 0 if no such number exists.
%C a(3k)=0. If any other zero terms are really nonzero, their value is greater than 4^31.  Larry Reeves (larryr(AT)acm.org), Dec 21 2002
%Y Cf. A069025.
%K nonn,base
%O 1,4
%A _Amarnath Murthy_, Apr 02 2002
%E More terms from Larry Reeves (larryr(AT)acm.org), Dec 21 2002
