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 A222238 #11 Mar 31 2017 00:18:12
%S A222238 0,1,2,8,4,5,6,7,3,9,10,11,12,18,14,15,16,17,13,19,20,21,22,28,24,25,
%T A222238 26,27,23,29,80,81,82,88,84,85,86,87,83,89,40,41,42,48,44,45,46,47,43,
%U A222238 49,50,51,52,58,54,55,56,57,53,59,60,61,62,68,64,65,66,67,63,69,70,71,72,78,74,75
%N A222238 In the number n, replace all (decimal) digits '3' with '8' and vice versa.
%C A222238 The map which is applied to primes in A171044.
%H A222238 Vincenzo Librandi, <a href="/A222238/b222238.txt">Table of n, a(n) for n = 0..1000</a>
%t A222238 a[n_]:= IntegerDigits[n]/.{3->8, 8->3} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 30 2013 *)
%o A222238 (PARI) A222238(n,d=[0, 1, 2, 8, 4, 5, 6, 7, 3, 9])={sum(i=1,#n=digits(n),d[n[i]+1]*10^(#n-i),!n*d[1])} \\ N.B.: digits(0)=[] in PA RI (v.2.6)
%Y A222238 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222238 nonn,base,easy
%O A222238 0,3
%A A222238 _M. F. Hasler_, Feb 13 2013