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 A222226 #11 Mar 31 2017 00:24:14
%S A222226 0,9,2,3,4,5,6,7,8,1,90,99,92,93,94,95,96,97,98,91,20,29,22,23,24,25,
%T A222226 26,27,28,21,30,39,32,33,34,35,36,37,38,31,40,49,42,43,44,45,46,47,48,
%U A222226 41,50,59,52,53,54,55,56,57,58,51,60,69,62,63,64,65,66
%N A222226 In the number n, replace all (decimal) digits '1' with '9' and vice versa.
%C A222226 The map which is applied to primes in A171050.
%H A222226 Vincenzo Librandi, <a href="/A222226/b222226.txt">Table of n, a(n) for n = 0..1000</a>
%t A222226 a[n_]:= IntegerDigits[n]/.{1->9, 9->1} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 30 2013 *)
%o A222226 (PARI) A222226(n,d=[0,9,2,3,4,5,6,7,8,1])=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 A222226 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222226 nonn,base,easy
%O A222226 0,2
%A A222226 _M. F. Hasler_, Feb 12 2013