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 A171029 #9 Mar 31 2017 20:25:58
%S A171029 2,3,5,7,66,63,67,69,23,29,36,37,46,43,47,53,59,16,17,76,73,79,83,89,
%T A171029 97,606,603,607,609,663,627,636,637,639,649,656,657,613,617,673,679,
%U A171029 686,696,693,697,699,266,223,227,229,233,239,246,256,257,213
%N A171029 In the sequence of prime numbers, replace all the '6' digits with '1' and vice versa.
%H A171029 Vincenzo Librandi, <a href="/A171029/b171029.txt">Table of n, a(n) for n = 1..1000</a>
%t A171029 FromDigits[IntegerDigits[#]/.{6->p, 1->q}/.{p->1, q->6}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)
%o A171029 (PARI) a(n)=my(v=[0,6,2,3,4,5,1,7,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 24 2013
%K A171029 nonn,base,easy
%O A171029 1,1
%A A171029 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010