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 A263242 #12 Oct 10 2016 12:04:14
%S A263242 31,71,73,97,311,701,733,743,751,761,907,937,941,953,967,971,983,991,
%T A263242 3221,9001,9221,9227,9551,9661,9883,32321,33931,34141,34841,35051,
%U A263242 36061,36761,37571,39791,70001,71711,72221,73331,74143,74441,74843,74941,75253,76261,76463,76561
%N A263242 Larger of emirp pairs that are merely reversals of their end digits.
%C A263242 The first digit is always larger than the last digit.
%H A263242 Harvey P. Dale, <a href="/A263242/b263242.txt">Table of n, a(n) for n = 1..500</a>
%t A263242 epQ[n_]:=Module[{idn=IntegerDigits[n],mid},mid=Rest[Most[idn]];PrimeQ[ IntegerReverse[n]]&&mid==Reverse[mid]&&idn[[1]]>idn[[-1]]]; Select[ Prime[Range[6,8000]],epQ] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 10 2016 *)
%Y A263242 Cf. A006567, A109309, A263240, A263241.
%K A263242 nonn,base
%O A263242 1,1
%A A263242 _Lekraj Beedassy_, Oct 13 2015
%E A263242 Corrected by _Harvey P. Dale_, Oct 10 2016