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 #8 Sep 01 2019 18:17:42
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,22,24,26,28,30,33,
%T 36,39,40,44,48,50,55,60,66,70,77,80,88,90,99,100,110,111,112,113,114,
%U 115,116,117,118,119,120,122,124,126,128,130,133,136,139,140,144,148
%N Numbers such that every digit is a multiple of the digit to its left.
%C The number of n-digit terms is (n^4+22n^3+95n^2+98n)/24. - David Wasserman
%H Robert Israel, <a href="/A096105/b096105.txt">Table of n, a(n) for n = 1..10000</a>
%p for i from 1 to 9 do g(i):= [seq(t,t=0..9,i)] od: g(0):= [0]:
%p A[1]:= [$1..9]:
%p for d from 2 to 4 do A[d]:= map(t -> op(10*t+~g(t mod 10)),A[d-1]) od:
%p map(op,[seq(A[d],d=1..4)]); # _Robert Israel_, Sep 01 2019
%Y Cf. A096106.
%K base,easy,nonn
%O 1,2
%A _Amarnath Murthy_, Jun 26 2004
%E Edited by _David Wasserman_, Dec 28 2005