%N Composite numbers n such that digits of prime factors of n are either 1 or 3.
%C All terms are a product of at least two terms of A020451. - _David A. Corneth_, Oct 09 2020
%H David A. Corneth, <a href="/A036303/b036303.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Alois P. Heinz)
%H <a href="/index/Pri#prime_factors">Index entries for sequences related to prime factors</a>
%e The composite 117 = 3^2 * 13 is in the sequence as the digits of the prime factors are either 1 or 3. - _David A. Corneth_, Oct 17 2020
%Y Cf. A003597, A036302-A036325.
%A _Patrick De Geest_, Dec 15 1998