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 A171016 #12 Mar 31 2017 20:31:54
%S A171016 2,0,5,7,11,10,17,19,20,29,1,7,41,40,47,50,59,61,67,71,70,79,80,89,97,
%T A171016 131,130,137,139,110,127,101,107,109,149,151,157,160,167,170,179,181,
%U A171016 191,190,197,199,211,220,227,229,200,209,241,251,257,260,269
%N A171016 In the sequence of prime numbers, replace all the '3' digits with '0' and vice versa.
%H A171016 Vincenzo Librandi, <a href="/A171016/b171016.txt">Table of n, a(n) for n = 1..1000</a>
%t A171016 FromDigits[IntegerDigits[#]/.{3->p, 0->q}/.{p->0, q->3}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Mar 11 2013 *)
%o A171016 (PARI) a(n)=my(v=[3,1,2,0,4,5,6,7,8,9]);apply(k->v[k+1],digits(prime(n))) \\ _Charles R Greathouse IV_, Jul 16 2013
%K A171016 nonn,base,easy
%O A171016 1,1
%A A171016 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010