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 A169737 #4 Aug 23 2019 17:27:28 %S A169737 100,101,103,107,115,122,127,137,148,161,169,185,199,218,229,242,250, %T A169737 257,271,281,292,305,313,320,325,335,346,359,376,392,406,416,427,440, %U A169737 448,464,478,497,517,530,538,554,568,587,607,620,628,644,658,677,697,719,736,752 %N A169737 a(1) = 100; for n>1, a(n) = a(n-1) + digitsum(a(n-1)). %t A169737 NestList[#+Total[IntegerDigits[#]]&,100,60] (* _Harvey P. Dale_, Aug 23 2019 *) %Y A169737 Cf. A169732, A007618. First differences are A065075. %K A169737 nonn,base %O A169737 1,1 %A A169737 _N. J. A. Sloane_, May 01 2010