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 A068823 #17 Mar 18 2018 04:06:57 %S A068823 9,8,21,12,5,12,21,8,9,90,979,264,1131,602,255,336,1411,738,1539,80, %T A068823 1659,858,1771,456,75,962,1971,504,2059,210,2139,544,2211,1122,455, %U A068823 576,2331,1178,2379,120,2419,1218,2451,616,495,1242,2491,624,2499,50 %N A068823 a(n) = lcm(n, c(n)), where c(n) is the 10's complement of n. %H A068823 Alois P. Heinz, <a href="/A068823/b068823.txt">Table of n, a(n) for n = 1..10000</a> %e A068823 a(45) = 495 as 10's complement of 45 is 100 - 45 = 55 and lcm(45, 55) = 495. %p A068823 a:=n-> ilcm((10^length(n)-n), n): %p A068823 seq(a(n), n=1..100); # _Alois P. Heinz_, Sep 22 2015 %t A068823 LCM[#, 10^(IntegerLength[#]) - #] & /@ Range[50] (* _Jayanta Basu_, Aug 07 2013 *) %Y A068823 Cf. A068822. %K A068823 easy,nonn,look,base %O A068823 1,1 %A A068823 _Amarnath Murthy_, Mar 08 2002 %E A068823 a(20) corrected by _Jayanta Basu_, Aug 07 2013