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 A222215 #11 Mar 31 2017 00:30:41
%S A222215 6,1,2,3,4,5,0,7,8,9,16,11,12,13,14,15,10,17,18,19,26,21,22,23,24,25,
%T A222215 20,27,28,29,36,31,32,33,34,35,30,37,38,39,46,41,42,43,44,45,40,47,48,
%U A222215 49,56,51,52,53,54,55,50,57,58,59,6,1,2,3,4,5,0,7,8,9,76,71,72,73,74,75
%N A222215 In the number n, replace all (decimal) digits '0' with '6' and vice versa.
%C A222215 The map which is applied to primes in A171028.
%H A222215 Vincenzo Librandi, <a href="/A222215/b222215.txt">Table of n, a(n) for n = 0..1000</a>
%t A222215 a[n_]:= IntegerDigits[n]/.{0->6, 6->0} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 29 2013 *)
%o A222215 (PARI) A222215(n,d=[6,1,2,3,4,5,0,7,8,9])={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 A222215 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222215 nonn,base,easy
%O A222215 0,1
%A A222215 _M. F. Hasler_, Feb 12 2013