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A032717 n prefixed by '9' and followed by '3' is a prime. 1
5, 8, 10, 13, 17, 20, 28, 29, 32, 34, 40, 41, 43, 46, 47, 53, 61, 62, 64, 73, 74, 80, 83, 88, 92, 97, 103, 115, 116, 118, 119, 124, 125, 128, 130, 137, 139, 142, 143, 145, 146, 149, 151, 157, 158, 167, 170, 173, 175, 181, 182, 187, 194, 200, 203, 208, 214 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Matthew House, Table of n, a(n) for n = 1..10000

EXAMPLE

953 is prime, so 5 is a term.

MATHEMATICA

Select[Range[250], PrimeQ[FromDigits[Join[{9}, IntegerDigits[#], {3}]]]&] (* Harvey P. Dale, Jul 30 2013 *)

CROSSREFS

Sequence in context: A287073 A022160 A022158 * A256360 A205676 A098594

Adjacent sequences:  A032714 A032715 A032716 * A032718 A032719 A032720

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

EXTENSIONS

Offset corrected by Matthew House, Jan 15 2017

STATUS

approved

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Last modified May 30 11:15 EDT 2020. Contains 334724 sequences. (Running on oeis4.)