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

Author

Patrick De Geest, May 15 1998

Keywords

• nonn
• base

Comments

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

Examples

			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.

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024