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 A192137 #11 Jul 02 2017 19:35:18 %S A192137 2,3,4,5,7,8,9,11,16,25,27,32,39,49,64,69,81,101,117,119,121,125,128, %T A192137 129,131,151,159,181,191,207,219,243,249,256,259,313,329,339,343,351, %U A192137 353 %N A192137 Numbers m such that their concatenation of prime divisors are palindromic numbers. %C A192137 The corresponding values of palindromic concatenation in A192138. Superset of A002385 (palindromic primes), A192139 and A192140. %H A192137 Harvey P. Dale, <a href="/A192137/b192137.txt">Table of n, a(n) for n = 1..1000</a> %e A192137 Concatenation of prime divisors of 39 = 3 * 13 is 313 (palindromic number). %t A192137 Select[Range[2,500],PalindromeQ[FromDigits[Flatten[IntegerDigits/@ FactorInteger[ #][[All,1]]]]]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jul 02 2017 *) %Y A192137 Cf. A002113, A002385, A084317, A084092, A192138, A192139, A192140, A192141. %K A192137 nonn,base %O A192137 1,1 %A A192137 _Jaroslav Krizek_, Jun 24 2011