A103834 - OEIS

%I #12 Jun 18 2023 13:56:58

%S 131,919,12821,19991,35353,37273,93139,94049,1065601,1093901,1126211,

%T 1193911,1201021,1362631,1422241,1646461,1707071,1826281,1952591,

%U 1988891,3285823,3444443,3452543,3517153,3601063,3673763,7461647

%N Palindromic primes pp such that 9876543210pp0123456789 is palindromic prime.

%C All palindromic primes have odd number of digits.

%C There are two 3-digit, six 5-digit and 42 7-digit palprimes pp such that 9876543210pp0123456789 is palindromic prime.

%H Chai Wah Wu, <a href="/A103834/b103834.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Prime[Range[510000]],PalindromeQ[#]&&PrimeQ[FromDigits[Join[Range[9,0,-1],IntegerDigits[ #],Range[0,9]]]]&] (* _Harvey P. Dale_, Jun 18 2023 *)

%K nonn,base

%O 1,1

%A _Zak Seidov_, Mar 30 2005