A032738 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..32.

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

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024

Status

approved