%I

%S 4,6,9,10,14,15,21,25,35,49

%N Composite numbers n such that juxtaposition of prime factors of n has length 2.

%C There are exactly 10 such numbers.

%Y Cf. A036327-A036334, A046368.

%K nonn,base,fini,full

%O 1,1

%A _Patrick De Geest_, Dec 15 1998