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 A222235 #11 Mar 31 2017 00:20:14
%S A222235 0,1,2,5,4,3,6,7,8,9,10,11,12,15,14,13,16,17,18,19,20,21,22,25,24,23,
%T A222235 26,27,28,29,50,51,52,55,54,53,56,57,58,59,40,41,42,45,44,43,46,47,48,
%U A222235 49,30,31,32,35,34,33,36,37,38,39,60,61,62,65,64,63,66,67,68,69,70,71,72,75,74,73
%N A222235 In the number n, replace all (decimal) digits '3' with '5' and vice versa.
%C A222235 The map which is applied to primes in A171026.
%H A222235 Vincenzo Librandi, <a href="/A222235/b222235.txt">Table of n, a(n) for n = 0..1000</a>
%t A222235 a[n_]:= IntegerDigits[n]/.{3->5, 5->3} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 30 2013 *)
%o A222235 (PARI) A222235(n,d=[0,1,2,5,4,3,6,7,8,9])={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 A222235 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222235 nonn,base,easy
%O A222235 0,3
%A A222235 _M. F. Hasler_, Feb 12 2013