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A032728 n prefixed by '3' and followed by '9' is a prime. 1
4, 5, 7, 8, 10, 11, 16, 20, 22, 25, 29, 31, 32, 35, 38, 44, 46, 49, 52, 53, 55, 65, 70, 71, 73, 76, 77, 88, 91, 92, 98, 101, 103, 106, 107, 113, 115, 118, 121, 124, 125, 131, 137, 146, 148, 164, 169, 172, 176, 179, 184, 185, 200, 202, 205, 206, 208, 209, 211 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

Select[Range[250], PrimeQ[FromDigits[Join[{3}, IntegerDigits[#], {9}]]]&] (* Harvey P. Dale, Aug 17 2021 *)

CROSSREFS

Sequence in context: A288753 A202186 A247467 * A078577 A225387 A037259

Adjacent sequences:  A032725 A032726 A032727 * A032729 A032730 A032731

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)