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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
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 * A361300 A256360 A205676
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 March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)