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 A171024 #9 Mar 31 2017 20:28:27
%S A171024 2,3,1,7,55,53,57,59,23,29,35,37,45,43,47,13,19,65,67,75,73,79,83,89,
%T A171024 97,505,503,507,509,553,527,535,537,539,549,515,517,563,567,573,579,
%U A171024 585,595,593,597,599,255,223,227,229,233,239,245,215,217,263
%N A171024 In the sequence of prime numbers, replace all the '5' digits with '1' and vice versa.
%H A171024 Vincenzo Librandi, <a href="/A171024/b171024.txt">Table of n, a(n) for n = 1..1000</a>
%t A171024 FromDigits[IntegerDigits[#]/.{5->p, 1->q}/.{p->1, q->5}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)
%o A171024 (PARI) a(n)=my(v=[0,5,2,3,4,1,6,7,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 16 2013
%K A171024 nonn,base,easy
%O A171024 1,1
%A A171024 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010