Search: id:A051801
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%I A051801
%S A051801 1,1,2,3,4,5,6,7,8,9,1,1,2,3,4,5,6,7,8,9,2,2,4,6,8,10,12,14,
%T A051801 16,18,3,3,6,9,12,15,18,21,24,27,4,4,8,12,16,20,24,28,32,36,5,
%U A051801 5,10,15,20,25,30,35,40,45,6,6,12,18,24,30,36,42,48,54,7,7,14
%N A051801 Product of nonzero digits of n.
%H A051801 Zak Seidov, <a href="b051801.txt">Table of n, a(n) for n = 0..1000.</
               a>
%F A051801 a(n) = if n=0 then 1 else a([n/10]) * (n mod 10 + 0^(n mod 10)). [From 
               Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 13 2009]
%e A051801 a(0) = 1 since an empty product is 1 by convention. a(120) = 1*2 = 2.
%Y A051801 Basis for A051802.
%Y A051801 Sequence in context: A067456 A052429 A051802 this_sequence A071205 A066750 
               A032762
%Y A051801 Adjacent sequences: A051798 A051799 A051800 this_sequence A051802 A051803 
               A051804
%K A051801 nonn,easy,base,nice
%O A051801 0,3
%A A051801 Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999

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