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 A171028 #9 Mar 31 2017 20:26:27
%S A171028 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,1,7,71,73,79,83,89,97,
%T A171028 161,163,167,169,113,127,131,137,139,149,151,157,103,107,173,179,181,
%U A171028 191,193,197,199,211,223,227,229,233,239,241,251,257,203,209
%N A171028 In the sequence of prime numbers, replace all the '6' digits with '0' and vice versa.
%H A171028 Vincenzo Librandi, <a href="/A171028/b171028.txt">Table of n, a(n) for n = 1..1000</a>
%t A171028 FromDigits[IntegerDigits[#]/.{6->p, 0->q}/.{p->0, q->6}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)
%o A171028 (PARI) a(n)=my(v=[6,1,2,3,4,5,0,7,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 24 2013
%K A171028 nonn,base,easy
%O A171028 1,1
%A A171028 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010