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 A143260 #4 Oct 29 2017 14:29:54 %S A143260 2,3,5,7,11,19,23,29,41,43,47,53,59,61,67,83,89,101,103,109,127,131, %T A143260 137,139,151,163,173,181,191,193,197,211,223,227,229,233,239,241,251, %U A143260 257,263,269,271,277,281,283,293,307,313,317,331,349,353,367,373,379,383 %N A143260 Primes that are not emirps. %C A143260 Complement of A006567 with respect to A000040. %t A143260 Select[Prime[Range[100]],PalindromeQ[#]||!PrimeQ[IntegerReverse[#]]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 29 2017 *) %K A143260 nonn,base %O A143260 1,1 %A A143260 _Lekraj Beedassy_, Aug 02 2008