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 A367728 #11 Dec 01 2023 15:56:26 %S A367728 1,1,3,2,5,3,7,4,9,5,1,6,13,7,3,8,17,9,19,2,21,2,23,24,25,26,27,28,29, %T A367728 30,31,8,3,17,5,9,37,19,39,10,41,42,43,4,45,46,47,48,49,50,51,26,53, %U A367728 27,5,28,57,29,59,30,61,62,63,64,13,6,67,68,69,14,71,9 %N A367728 a(n) is the denominator of (R(n) - 1)/(n + 1), where R(n) is the digit reversal of n. %H A367728 Stefano Spezia, <a href="/A367728/b367728.txt">Table of n, a(n) for n = 0..10000</a> %t A367728 a[n_]:=Denominator[(FromDigits[Reverse[IntegerDigits[n]]]-1)/(n+1)]; Array[a,72,0] %o A367728 (PARI) a(n) = denominator((fromdigits(Vecrev(digits(n)))-1)/(n+1)); \\ _Michel Marcus_, Nov 28 2023 %Y A367728 Cf. A004086, A367593, A367727 (numerator). %K A367728 nonn,base,easy,frac,look %O A367728 0,3 %A A367728 _Stefano Spezia_, Nov 28 2023