%I A052406
%S A052406 0,1,2,3,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,25,26,27,28,
%T A052406 29,30,31,32,33,35,36,37,38,39,50,51,52,53,55,56,57,58,59,60,61,62,63,
%U A052406 65,66,67,68,69,70,71,72,73,75,76,77,78,79,80,81,82,83,85,86,87,88,89
%N A052406 Numbers without 4 as a digit.
%C A052406 This is a frequent sequence on Chinese, Japanese and Korean elevator 
               buttons - Jean-Sebastien Girard (circeus(AT)hotmail.com), Jul 28 
               2008
%H A052406 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               UbanNumber.html">Uban Number</a>
%H A052406 Wikipedia, <a href="http://en.wikipedia.org/wiki/Tetraphobia">Tetraphobia</
               a>.
%o A052406 (PARI) g(n) = { local(x,v,j,flag); for(x=1,n, v=Vec(Str(x)); flag=1; 
               for(j=1,length(v), if(v[j]=="4",flag=0)); if(flag,print1(x",") ) 
               ) } - Cino Hilliard (hillcino368(AT)hotmail.com), Apr 01 2007
%Y A052406 Cf. A004179, A004723.
%Y A052406 Cf. A011760.
%Y A052406 Sequence in context: A023839 A004723 A089590 this_sequence A022306 A081023 
               A031179
%Y A052406 Adjacent sequences: A052403 A052404 A052405 this_sequence A052407 A052408 
               A052409
%K A052406 base,easy,nonn
%O A052406 1,3
%A A052406 Henry Bottomley (se16(AT)btinternet.com), Mar 13 2000