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A032737 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' suffixes are allowed). 1
5620, 7358, 13308, 13332, 13650, 14612, 26302, 27971, 28472, 28838, 29542, 29650, 31328, 33027, 33170, 35914, 35970, 36186, 39608, 40078, 41165, 41528, 42422, 44657, 47172, 47382, 48046, 48052, 48454, 50774, 52735, 55553, 60222 (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..32.

EXAMPLE

55553 prefixed with a digit from (1,2,3,4,5,6,7,8,9) and followed by a digit from ('',1,3,7,9) never yields a prime: '3'55553'_' = 11 x 32323; '2'5620'9' = 3 x 41 x 2083.

CROSSREFS

Cf. A032682-A032685 and A032702-A032733.

Sequence in context: A126784 A071813 A074242 * A237507 A198164 A058003

Adjacent sequences:  A032734 A032735 A032736 * A032738 A032739 A032740

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified March 5 11:57 EST 2021. Contains 341823 sequences. (Running on oeis4.)