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 A222232 #12 Mar 31 2017 00:21:49
%S A222232 0,1,8,3,4,5,6,7,2,9,10,11,18,13,14,15,16,17,12,19,80,81,88,83,84,85,
%T A222232 86,87,82,89,30,31,38,33,34,35,36,37,32,39,40,41,48,43,44,45,46,47,42,
%U A222232 49,50,51,58,53,54,55,56,57,52,59,60,61,68,63,64,65,66,67,62,69
%N A222232 In the number n, replace all (decimal) digits '2' with '8' and vice versa.
%C A222232 The map which is applied to primes in A171043.
%H A222232 Vincenzo Librandi, <a href="/A222232/b222232.txt">Table of n, a(n) for n = 0..1000</a>
%t A222232 a[n_]:= IntegerDigits[n]/.{2->8, 8->2} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 30 2013 *)
%o A222232 (PARI) A222232(n,d=[0,1,8,3,4,5,6,7,2,9])=sum(i=1, #n=digits(n), d[n[i]+1]*10^(#n-i)) \\ gives correct value for n=0 iff d[1]=0, since digits(0)=[] in PARI (v.2.6)
%Y A222232 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222232 nonn,base,easy
%O A222232 0,3
%A A222232 _M. F. Hasler_, Feb 12 2013