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 A222223 #12 Mar 31 2017 00:25:35
%S A222223 0,6,2,3,4,5,1,7,8,9,60,66,62,63,64,65,61,67,68,69,20,26,22,23,24,25,
%T A222223 21,27,28,29,30,36,32,33,34,35,31,37,38,39,40,46,42,43,44,45,41,47,48,
%U A222223 49,50,56,52,53,54,55,51,57,58,59,10,16,12,13,14,15,11,17,18,19,70,76,72,73,74,75
%N A222223 In the number n, replace all (decimal) digits '1' with '6' and vice versa.
%C A222223 The map which is applied to primes in A171029.
%H A222223 Vincenzo Librandi, <a href="/A222223/b222223.txt">Table of n, a(n) for n = 0..1000</a>
%t A222223 a[n_]:= IntegerDigits[n]/.{1->6, 6->1} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 29 2013 *)
%o A222223 (PARI) A222223(n,d=[0,6,2,3,4,5,1,7,8,9])=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 A222223 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222223 nonn,base,easy
%O A222223 0,2
%A A222223 _M. F. Hasler_, Feb 12 2013