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 A254898 #19 Feb 07 2019 15:23:27
%S A254898 1,41,141,5141,95141,295141,6295141,56295141,356295141,5356295141,
%T A254898 85356295141,985356295141,7985356295141,97985356295141,
%U A254898 397985356295141,2397985356295141,32397985356295141,832397985356295141,4832397985356295141,64832397985356295141,264832397985356295141
%N A254898 Read the first n decimal digits of Pi-3 backwards.
%C A254898 a(n) is A039916(n) read backwards.
%C A254898 With the 3 on the end: A092845.
%F A254898 a(n) = A004086(A039916(n)). - _Alois P. Heinz_, Feb 16 2015
%t A254898 Module[{nn=30,pd},pd=Rest[RealDigits[Pi,10,nn][[1]]];Table[FromDigits[ Reverse[ Take[pd,n]]],{n,nn-1}]] (* _Harvey P. Dale_, Feb 07 2019 *)
%Y A254898 Cf. A000796, A004086, A039916, A092845.
%K A254898 nonn,base,dumb,easy
%O A254898 1,2
%A A254898 _Christian Perfect_, Feb 10 2015