A032722 n prefixed by '5' and followed by '7' is a prime.

4, 5, 7, 8, 10, 14, 16, 19, 22, 23, 29, 34, 38, 40, 41, 43, 47, 50, 52, 55, 64, 65, 71, 73, 80, 82, 85, 86, 89, 92, 98, 104, 113, 115, 119, 121, 125, 128, 130, 134, 140, 142, 143, 148, 151, 157, 160, 163, 164, 176, 178, 179, 181, 182, 190, 197, 202, 205, 206, 212

Offset

0,1

Links

Table of n, a(n) for n=0..59.

Mathematica

Select[Range[250], PrimeQ[FromDigits[Join[{5}, IntegerDigits[#], {7}]]]&] (* Harvey P. Dale, Jul 24 2011 *)

Crossrefs

Sequence in context: A189707 A120163 A088763 * A293856 A098416 A005556

Adjacent sequences: A032719 A032720 A032721 * A032723 A032724 A032725

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Status

approved