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 A254323 #7 Feb 27 2015 16:43:21 %S A254323 1,4,7,16,28,34,37,49,67,136,148,238,259,268,34,37,367,469,67,156, %T A254323 1258,136,1348,1369,1468,278,238,2359,2479,2569,268,34,37,367,367,489, %U A254323 469,67,1356,1458,12358,12469,12478,136,1348,13468,13579,1468,2378,2579 %N A254323 Remove in decimal representation of A254143(n) all repeated digits. %C A254323 a(n) <= 123456789 for all n, and a(n) < 123456789 for n < 396; %C A254323 a(396) = 123456789 = A050289(1); %C A254323 a(n) = A137564(A254143(n)) = A004086(A227362(A254143(n))). %H A254323 Reinhard Zumkeller, <a href="/A254323/b254323.txt">Table of n, a(n) for n = 1..10000</a> %o A254323 (Haskell) %o A254323 a254323 = a137564 . a254143 %Y A254323 Cf. A254143, A137564, A227362, A004086, A050289. %Y A254323 Cf. A254338 (initial digits), A254339 (final digits). %K A254323 nonn,base %O A254323 1,2 %A A254323 _Reinhard Zumkeller_, Jan 28 2015