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A032735 Palindromes that cannot be prefixed and followed by any digit to form a prime. 1

%I

%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

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Last modified September 22 02:38 EDT 2021. Contains 347605 sequences. (Running on oeis4.)