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 A104341 #7 Jul 22 2021 04:45:25 %S A104341 10,21,32,43,54,65,76,87,98 %N A104341 Numbers n such that n -(digital reversal of n) = 9. %C A104341 The sequence is complete: there is no other such number (in base 10). Starting with n=2, A104341(n) = digital reversal of A104341(n-1). %H A104341 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %F A104341 n -(digital reversal of n) = 9 %e A104341 98-89=9. %t A104341 npdrnQ[n_]:=n-FromDigits[Reverse[IntegerDigits[n]]]==9; Select[Range[100], npdrnQ] (* _Harvey P. Dale_, Apr 04 2013 *) %Y A104341 Cf. A104340, A346261. %K A104341 base,nonn,fini,full %O A104341 1,1 %A A104341 _Zak Seidov_, Mar 02 2005