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 A171047 #14 Jul 09 2025 04:31:40
%S A171047 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,81,87,71,73,79,63,69,
%T A171047 97,101,103,107,109,113,127,131,137,139,149,151,157,183,187,173,179,
%U A171047 161,191,193,197,199,211,223,227,229,233,239,241,251,257,283
%N A171047 In the sequence of prime numbers, replace all the '8' digits with '6' and vice versa.
%H A171047 Vincenzo Librandi, <a href="/A171047/b171047.txt">Table of n, a(n) for n = 1..1000</a>
%t A171047 FromDigits[IntegerDigits[#]/.{8->p,6->q}/.{p->6,q->8}]&/@ Prime[ Range[ 70]] (* _Harvey P. Dale_, Jul 20 2011 *)
%o A171047 (PARI) a(n)=my(v=[0,1,2,3,4,5,8,7,6,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 31 2013
%K A171047 nonn,base,easy
%O A171047 1,1
%A A171047 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010