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 A249044 #12 Dec 25 2021 18:35:23 %S A249044 9,20,42,64,75,86,108,110,121,132,143,154,165,176,187,198,209,222,244, %T A249044 255,266,288,299,310,312,323,334,345,356,378,400,411,413,424,435,446, %U A249044 468,490,501,512,514,525,536,558,580,591,602,615,626,637,648,670,681,692,703,714,716,738,749,760,771,782 %N A249044 Composite self-numbers. %D A249044 D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately Printed, 311 Devlali Camp, Devlali, India, 1963. %H A249044 Reinhard Zumkeller, <a href="/A249044/b249044.txt">Table of n, a(n) for n = 1..10000</a> %H A249044 D. R. Kaprekar, <a href="/A003052/a003052_2.pdf">The Mathematics of the New Self Numbers</a> [annotated and scanned] %o A249044 (Haskell) %o A249044 a249044 n = a249044_list !! (n-1) %o A249044 a249044_list = filter ((== 0) . a010051') $ tail a003052_list %o A249044 -- _Reinhard Zumkeller_, Oct 31 2014 %Y A249044 Cf. A003052, A006378, A171671. %Y A249044 Cf. A002808, A010051, A062028. %K A249044 nonn,base %O A249044 1,1 %A A249044 _N. J. A. Sloane_, Oct 30 2014