A032730 Numbers k such that k prefixed by '5' and followed by '9' is prime.

0, 6, 9, 11, 17, 18, 20, 27, 30, 39, 41, 44, 47, 51, 56, 63, 65, 66, 68, 74, 77, 83, 84, 86, 87, 93, 105, 110, 116, 119, 122, 123, 132, 134, 141, 143, 144, 147, 153, 159, 165, 167, 171, 174, 176, 182, 183, 185, 186, 189, 192, 194, 200, 206, 218, 224, 225

Offset

1,2

Links

Table of n, a(n) for n=1..57.

Mathematica

Select[Range[0, 250], PrimeQ[FromDigits[Join[{5}, IntegerDigits[#], {9}]]]&] (* Harvey P. Dale, May 09 2011 *)

Crossrefs

Cf. A032702-A032733.

Sequence in context: A202137 A302580 A031256 * A275274 A131834 A084418

Adjacent sequences: A032727 A032728 A032729 * A032731 A032732 A032733

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024

Status

approved