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 A192140 #10 Aug 06 2024 02:06:28
%S A192140 2,3,4,5,7,8,9,11,101,121,131,151,181,191,313,343,353,373,383,727,747,
%T A192140 757,787,797,919,929,1331,10001,10201,10301,10501,10601,11311,11411,
%U A192140 12421,12721,12821,13331,13831,13931,14341,14641,14741,15451,15551,16061,16361
%N A192140 Palindromic numbers m such that their concatenation of prime divisors are also palindromic numbers.
%C A192140 The corresponding values of palindromic concatenation in A192141.
%C A192140 Superset of A002385 (palindromic primes) and A084092 (prime power decimal palindromes).
%C A192140 Subset of A002113 (palindromic numbers) and A192137.
%e A192140 Concatenation of prime divisors of number 747 = 3^2 * 83 is 383 (palindromic number).
%t A192140 f[n_] := FromDigits[Flatten[IntegerDigits /@ FactorInteger[n][[;; , 1]]]]; Select[Range[2, 20000], And @@ (PalindromeQ /@ {#, f[#]}) &] (* _Amiram Eldar_, Aug 06 2024 *)
%Y A192140 Cf. A002113, A002385, A084317, A084092, A192137, A192138, A192139, A192141.
%K A192140 nonn,base
%O A192140 1,1
%A A192140 _Jaroslav Krizek_, Jun 24 2011
%E A192140 More terms from _Amiram Eldar_, Aug 06 2024