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A032735 Palindromes that cannot be prefixed or 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

Chai Wah Wu, Table of n, a(n) for n = 1..10000

EXAMPLE

11111 prefixed or 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

Cf. A032682-A032685 and A032702-A032733.

Sequence in context: A235405 A158619 A094324 * A038447 A115834 A115810

Adjacent sequences:  A032732 A032733 A032734 * A032736 A032737 A032738

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified May 21 18:58 EDT 2019. Contains 323444 sequences. (Running on oeis4.)