%I A016115
%S A016115 4,1,15,0,93,0,668,0,5172,0,42042,0,353701,0,3036643,0,27045226,0,
%T A016115 239093865,0,2158090933,0
%N A016115 Number of prime palindromes with n digits.
%C A016115 Every palindrome with an even number of digits is divisible by 11 and 
               therefore is composite (not prime). Hence there is only one palindromic 
               prime with an even number of digits. - Martin Renner (martin.renner(AT)gmx.net), 
               Apr 15 2006
%H A016115 K. S. Brown, <a href="http://www.mathpages.com/home/kmath359.htm">On 
               General Palindromic Numbers</a>
%H A016115 P. De Geest, <a href="http://www.worldofnumbers.com/palpri.htm">World!Of 
               Palindromic Primes</a>
%H A016115 Shyam Sunder Gupta, <a href="http://listserv.nodak.edu/cgi-bin/wa.exe?A1=ind0602&L=nmbrthry">
               Palindromic Primes up to 10^19</a>.
%H A016115 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PalindromicPrime.html">Link to a section of The World of Mathematics.</
               a>
%Y A016115 Cf. A002385, A040025.
%Y A016115 Sequence in context: A050156 A096644 A145829 this_sequence A164794 A107873 
               A156290
%Y A016115 Adjacent sequences: A016112 A016113 A016114 this_sequence A016116 A016117 
               A016118
%K A016115 nonn,hard,base
%O A016115 1,1
%A A016115 Robert G. Wilson v (rgwv(AT)rgwv.com)
%E A016115 Corrected and extended by Patrick De Geest (pdg(AT)worldofnumbers.com), 
               Jun 15 1998.
%E A016115 '27045226' was found in collaboration with Martin Eibl (M.EIBL(AT)LINK-R.de), 
               Carlos Rivera (crivera(AT)ux1.sci.net.mx), Warut Roonguthai (warut822(AT)yahoo.com)
%E A016115 a(19) from Shyam Sunder Gupta (guptass(AT)rediffmail.com), Feb 12 2006
%E A016115 a(21) - a(22) from Shyam Sunder Gupta (guptass(AT)rediffmail.com), Mar 
               13 2009