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 A222254 #13 Jan 23 2018 06:51:20
%S A222254 0,1,2,3,4,5,6,7,9,8,10,11,12,13,14,15,16,17,19,18,20,21,22,23,24,25,
%T A222254 26,27,29,28,30,31,32,33,34,35,36,37,39,38,40,41,42,43,44,45,46,47,49,
%U A222254 48,50,51,52,53,54,55,56,57,59,58,60,61,62,63,64,65,66,67,69,68,70,71,72,73,74,75
%N A222254 In the number n, replace all (decimal) digits '8' with '9' and vice versa.
%C A222254 The map which is applied to primes in A171057.
%H A222254 Vincenzo Librandi, <a href="/A222254/b222254.txt">Table of n, a(n) for n = 0..1000</a>
%t A222254 a[n_]:= IntegerDigits[n]/.{8->9, 9->8}//FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 29 2013 *)
%o A222254 (PARI) A222254(n,d=[0, 1, 2, 3, 4, 5, 6, 7, 9, 8])=sum(i=1,#n=digits(n),d[n[i]+1]*10^(#n-i),!n*d[1]) \\ N.B.: digits(0)=[] in PARI (v.2.6)
%Y A222254 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222254 nonn,base,easy
%O A222254 0,3
%A A222254 _M. F. Hasler_, Feb 13 2013