Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #13 Jun 25 2020 01:59:00
%S 11111,60806,65356,1115111,1392931,1643461,1762671,1797971,1799971,
%T 1863681,1911191,2005002,2190912,2429242,2499942,2512152,2708072,
%U 2714172,2794972,2845482,2848482,2942492,2993992,3150513,3239323
%N Palindromes that cannot be prefixed and followed by any digit to form a prime.
%H Chai Wah Wu, <a href="/A032735/b032735.txt">Table of n, a(n) for n = 1..10000</a>
%e 11111 prefixed and followed with a digit from (1,2,3,4,5,6,7,8,9) never yields a prime: '2'11111'3' = 29 x 72797.
%Y Cf. A032682-A032685 and A032702-A032733.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, May 15 1998