%I A104690
%S A104690 4,445,4414,44441,444441,4444441,44444441,444444449,4444444441,
%T A104690 44444444443,444444444447,4444444444443,44444444444441,444444444444445,
%U A104690 4444444444444447,44444444444444447,444444444444444442
%N A104690 Smallest semiprime containing exactly n 4's.
%e A104690 a(2)=445 because 445 is the smallest semiprime containing exactly two 
               4's.
%Y A104690 Sequence in context: A053780 A159514 A034985 this_sequence A035483 A145570 
               A053292
%Y A104690 Adjacent sequences: A104687 A104688 A104689 this_sequence A104691 A104692 
               A104693
%K A104690 base,nonn
%O A104690 1,1
%A A104690 Shyam Sunder Gupta (guptass(AT)rediffmail.com), Apr 24 2005