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 A222247 #10 Mar 30 2017 22:41:16
%S A222247 0,1,2,3,4,8,6,7,5,9,10,11,12,13,14,18,16,17,15,19,20,21,22,23,24,28,
%T A222247 26,27,25,29,30,31,32,33,34,38,36,37,35,39,40,41,42,43,44,48,46,47,45,
%U A222247 49,80,81,82,83,84,88,86,87,85,89,60,61,62,63,64,68,66,67,65,69,70,71,72,73,74,78
%N A222247 In the number n, replace all (decimal) digits '5' with '8' and vice versa.
%C A222247 The map which is applied to primes in A171046.
%H A222247 Vincenzo Librandi, <a href="/A222247/b222247.txt">Table of n, a(n) for n = 0..1000</a>
%t A222247 a[n_]:= IntegerDigits[n]/.{5->8, 8->5} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 31 2013 *)
%o A222247 (PARI) A222247(n,d=[0, 1, 2, 3, 4, 8, 6, 7, 5, 9])=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 A222247 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222247 nonn,base,easy
%O A222247 0,3
%A A222247 _M. F. Hasler_, Feb 13 2013