This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A249764 #14 Nov 22 2014 00:06:20 %S A249764 15,30,105,120,150,222,375,585,1500,1695,1755,1800,2700,3449,3750, %T A249764 3840,4891,6720,7680,12000,13583,14400,15000,18750,19200,20940,28134, %U A249764 30000,34800,35625,46875,48000,68400,72504,75000,93750,120000,128400 %N A249764 Numbers which divide the concatenation, in ascending order, of their anti-divisors. %H A249764 Chai Wah Wu, <a href="/A249764/b249764.txt">Table of n, a(n) for n = 1..103</a> %e A249764 Anti-divisors of 15 are 2, 6, 10 and their concatenation in ascending order is 2610. Finally, 2610 / 15 = 174. %p A249764 P:=proc(q) local a,k,n; for n from 3 to q do a:=0; %p A249764 for k from 2 to n-1 do if abs((n mod k)-k/2)<1 then a:=a*10^(ilog10(k)+1)+k; fi; od; %p A249764 if type(a/n,integer) then print(n); fi; od; end: P(10^9); %Y A249764 Cf. A066272, A069872, A224930, A240265. %K A249764 nonn,base %O A249764 1,1 %A A249764 _Paolo P. Lava_, Nov 05 2014