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A032738 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed). 0
14612, 27971, 33170, 36186, 39608, 40078, 41165, 41528, 47382, 55553, 60806, 62318, 63056, 65970, 66818, 70558, 83986, 86145, 89072, 89280, 91538, 93160, 96222, 97908, 101532, 102852, 104609, 105275, 108312, 108615, 108792, 109934 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) itself cannot be a prime to start with.

LINKS

Table of n, a(n) for n=0..31.

EXAMPLE

104609 prefixed or followed by a digit from ('',1,2,3,4,5,6,7,8,9) never yields a prime: '_'104609'_' = 73 x 1433; '8'104609'3' = 3089 x 26237.

CROSSREFS

Cf. A032682-A032685 and A032702-A032733.

Sequence in context: A265651 A153428 A032736 * A252218 A133858 A023683

Adjacent sequences:  A032735 A032736 A032737 * A032739 A032740 A032741

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified February 25 14:40 EST 2021. Contains 341609 sequences. (Running on oeis4.)