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A032735 Palindromes that cannot be prefixed and followed by any digit to form a prime. 1
11111, 60806, 65356, 1115111, 1392931, 1643461, 1762671, 1797971, 1799971, 1863681, 1911191, 2005002, 2190912, 2429242, 2499942, 2512152, 2708072, 2714172, 2794972, 2845482, 2848482, 2942492, 2993992, 3150513, 3239323 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
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.
CROSSREFS
Sequence in context: A094324 A347911 A346001 * A308609 A038447 A115834
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
STATUS
approved

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Last modified July 25 03:19 EDT 2024. Contains 374586 sequences. (Running on oeis4.)