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 A171044 #14 Apr 22 2025 22:23:34
%S A171044 2,8,5,7,11,18,17,19,28,29,81,87,41,48,47,58,59,61,67,71,78,79,38,39,
%T A171044 97,101,108,107,109,118,127,181,187,189,149,151,157,168,167,178,179,
%U A171044 131,191,198,197,199,211,228,227,229,288,289,241,251,257,268
%N A171044 In the sequence of prime numbers, replace all the '8' digits with '3' and vice versa.
%H A171044 Vincenzo Librandi, <a href="/A171044/b171044.txt">Table of n, a(n) for n = 1..1000</a>
%t A171044 FromDigits[IntegerDigits[#]/.{8->p, 3->q}/.{p->3, q->8}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Mar 11 2013 *)
%o A171044 (PARI) a(n)=my(v=[0,1,2,8,4,5,6,7,3,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 31 2013
%K A171044 nonn,base,easy
%O A171044 1,1
%A A171044 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010