Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #15 Jan 08 2021 08:53:32
%S 1,1,1,2,1,2,1,3,2,1,3,1,1,4,3,2,1,5,1,2,2,2,5,1,6,3,2,2,7,1,1,4,3,3,
%T 2,7,1,9,1,4,3,3,3,9,1,2,1,7,4,5,1,3,8,2,2,13,1,2,5,5,5,1,6,2,12,2,3,
%U 2,12,5,2,7,3,1,1,6,10,4,3,17,2,3,2,7,10,7
%N Number of ways writing the n-th 7-smooth number as a product of decimal digits of some other number which has no digits equal to 1.
%C This sequence is A067734 without the zeros.
%H David A. Corneth, <a href="/A288738/b288738.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A002473, A007602, A067734.
%K nonn,base
%O 1,4
%A _David A. Corneth_, Jun 22 2017