A032736 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed).

14612, 27971, 29289, 33170, 36186, 38327, 39608, 40078, 41165, 41528, 43277, 44657, 47382, 55553, 55791, 58899, 60806, 62318, 63056, 65970, 66818, 70558, 73851, 80477, 81167, 83986, 86145, 89072, 89280, 90379, 91538, 93160, 96222

Offset: 1

Author

Patrick De Geest, May 15 1998

Keywords

• nonn
• base

Examples

			60806 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: '_'60806'3' = 43 x 79 x 179; '1'14612'3' = 3^3 x 11 x 17 x 227.
		

Crossrefs

Cf. A032682-A032685 and A032702-A032733.

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024