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 A109880 #9 Aug 09 2025 22:35:49
%S A109880 1,7,19,91,127,721,919,14491,19441,113491,177877,194311,778771,
%T A109880 1081801,1188811,1767169,1927207,1946491,7027291,9617671,16056847,
%U A109880 74775169,74865061,96157747,129869461,164968921,167828761,180676081,189202267,757333297,762202981,792333757,1917766117,7116677191
%N A109880 Numbers k such that k and its digit reversal both are difference of successive cubes.
%C A109880 A subsequence of A109879.
%e A109880 19 = 3^3-2^3 and 91 = 6^3-5^3.
%t A109880 okQ[x_]:=Module[{revx=FromDigits[Reverse[IntegerDigits[x]]]},And@@(And@@IntegerQ/@(n/.Solve[1+3n+3n^2==x,n])&&And@@IntegerQ/@(n/.Solve[1+3n+3n^2==revx,n]))]; Select[Range[20000], okQ] (* _Harvey P. Dale_, Aug 06 2007 *)
%Y A109880 Cf. A109879.
%K A109880 base,nonn
%O A109880 1,2
%A A109880 _Amarnath Murthy_, Jul 10 2005
%E A109880 More terms from _Harvey P. Dale_, Aug 06 2007
%E A109880 23 more terms from _Donovan Johnson_, Feb 21 2008