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 A159471 #5 Sep 17 2016 11:14:49
%S A159471 3,5,7,11,131,151,191,313,353,373,757,797,919,11311,13331,13931,15551,
%T A159471 17971,19391,19991,31513,33533,35153,35353,35753,37573,71317,71917,
%U A159471 75557,77377,77977,79397,79997,93139,93739,95959,97379,97579,1117111
%N A159471 Palindromic primes using only odd digits (1, 3, 5, 7 or 9).
%H A159471 Harvey P. Dale, <a href="/A159471/b159471.txt">Table of n, a(n) for n = 1..1000</a>
%t A159471 Table[Select[FromDigits/@Tuples[{1,3,5,7,9},n],PrimeQ[#]&& # == IntegerReverse[ #]&],{n,7}]//Flatten (* _Harvey P. Dale_, Sep 17 2016 *)
%Y A159471 Cf. A002385, A083185.
%K A159471 nonn,base,less
%O A159471 1,1
%A A159471 _Juri-Stepan Gerasimov_, Apr 13 2009
%E A159471 Entries checked by _R. J. Mathar_, May 21 2010