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%I #13 Mar 30 2012 19:00:28
%S 4,14,22,114,122,141,212,221,411,1114,1122,1141,1212,1221,1411,2112,
%T 2121,2211,11114,11122,11141,11212,11221,12112,12121,14111,21112,
%U 41111,111114,111122,111141,111212,111221,111411,112112,112211,114111,121112,121121,121211,122111
%N Composite numbers whose product of digits is 4.
%C Complement of A107690 with respect to A199987. Subsequence of A199983 (composite numbers whose multiplicative digital root is 4).
%e Number 122 is in sequence because 1*2*2=4.
%Y Cf. A107690 (primes whose product of digits is 4), A199987 (numbers whose product of digits is 4).
%K nonn,base
%O 1,1
%A _Jaroslav Krizek_, Nov 25 2011
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