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 A249043 #14 Dec 25 2021 18:35:23 %S A249043 42,48,60,66,78,93,105,111,114,120,123,129,141,147,159,174,186,201, %T A249043 204,210,213,219,231,237,249,264,276,291,303,309,321,327,339,354,366, %U A249043 381,393,408,420,426,438,453,465,480,492,507,519,534,546,561,573,588,609,624,636 %N A249043 a(1) = 42; a(n+1) = a(n) + sum of decimal digits of a(n). %D A249043 D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately Printed, 311 Devlali Camp, Devlali, India, 1963. %H A249043 Reinhard Zumkeller, <a href="/A249043/b249043.txt">Table of n, a(n) for n = 1..10000</a> %H A249043 D. R. Kaprekar, <a href="/A003052/a003052_2.pdf">The Mathematics of the New Self Numbers</a> [annotated and scanned] %H A249043 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %F A249043 a(n+1) = A062028(a(n)). - _Reinhard Zumkeller_, Oct 31 2014 %o A249043 (Haskell) %o A249043 a249043 n = a249043_list !! (n-1) %o A249043 a249043_list = iterate a062028 42 %o A249043 -- _Reinhard Zumkeller_, Oct 31 2014 %Y A249043 Cf. A004207, A016052, A007618, A006507, A016052, A036228. %Y A249043 Cf. A007953, A062028. %K A249043 easy,nonn,base %O A249043 1,1 %A A249043 _N. J. A. Sloane_, Oct 30 2014